tftypes: Allow DynamicPseudoType with known values

[bflad]

Reference: #94
Reference: #99
Reference: #100
Reference: #128
Closes #133

Reverts incorrect logic for handling DynamicPseudoType values in tftypes. This type information must be preserved when traversing the protocol, as Terraform CLI decodes values based on the schema information. If a concrete value type is used where DynamicPseudoType is expected, Terraform CLI will return errors such as (given an object of 4 attributes, when DynamicPseudoType is expected):

│ Error: ["manifest"]: msgpack: invalid code=84 decoding array length

[bflad]

@alexsomesan it seems to work as expected on the terraform-provider-kubernetes update-sdk branch after also including this branch via:

go get github.com/hashicorp/terraform-plugin-go@bflad-tftypes-DynamicPseudoType-values
go mod tidy
go mod vendor

But please reach out if it doesn't.

$ terraform apply
╷
│ Warning: Provider development overrides are in effect
│
│ The following provider development overrides are set in the CLI configuration:
│  - bflad/framework in /Users/bflad/go/bin
│  - hashicorp/awscc in /Users/bflad/go/bin
│  - hashicorp/corner in /Users/bflad/go/bin
│  - hashicorp/hashicups in /Users/bflad/go/bin
│  - hashicorp/kubernetes in /Users/bflad/go/bin
│  - hashicorp.com/edu/hashicups in /Users/bflad/go/bin
│
│ The behavior may therefore not match any released version of the provider and applying changes may cause the state to become incompatible with published releases.
╵

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # kubernetes_manifest.test-configmap will be created
  + resource "kubernetes_manifest" "test-configmap" {
      + manifest = {
          + apiVersion = "v1"
          + data       = {
              + foo = "bar"
            }
          + kind       = "ConfigMap"
          + metadata   = {
              + labels    = {
                  + app         = "test-app"
                  + environment = "production"
                }
              + name      = "test-config"
              + namespace = "default"
            }
        }
      + object   = {
          + apiVersion = "v1"
          + binaryData = (known after apply)
          + data       = {
              + "foo" = "bar"
            }
          + immutable  = (known after apply)
          + kind       = "ConfigMap"
          + metadata   = {
              + annotations                = (known after apply)
              + clusterName                = (known after apply)
              + creationTimestamp          = (known after apply)
              + deletionGracePeriodSeconds = (known after apply)
              + deletionTimestamp          = (known after apply)
              + finalizers                 = (known after apply)
              + generateName               = (known after apply)
              + generation                 = (known after apply)
              + labels                     = (known after apply)
              + managedFields              = (known after apply)
              + name                       = "test-config"
              + namespace                  = "default"
              + ownerReferences            = (known after apply)
              + resourceVersion            = (known after apply)
              + selfLink                   = (known after apply)
              + uid                        = (known after apply)
            }
        }
    }

Plan: 1 to add, 0 to change, 0 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

kubernetes_manifest.test-configmap: Creating...
kubernetes_manifest.test-configmap: Creation complete after 0s

Apply complete! Resources: 1 added, 0 changed, 0 destroyed.

[alexsomesan]

It works!

I've tested this with kubernetes_manifest resources following the scenario reported in issue #133 and can confirm this change resolves the reported issue.

➜  configmap git:(update-sdk) ✗ terraform apply -auto-approve
╷
│ Warning: Provider development overrides are in effect
│
│ The following provider development overrides are set in the CLI configuration:
│  - hashicorp/kubernetes in /Users/alex/work/terraform-provider-kubernetes
│
│ The behavior may therefore not match any released version of the provider and applying changes may cause the state to become incompatible with published releases.
╵

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # kubernetes_manifest.test-configmap will be created
  + resource "kubernetes_manifest" "test-configmap" {
      + manifest = {
          + apiVersion = "v1"
          + data       = {
              + foo = "bar"
            }
          + kind       = "ConfigMap"
          + metadata   = {
              + labels    = {
                  + app         = "test-app"
                  + environment = "production"
                }
              + name      = "test-config"
              + namespace = "default"
            }
        }
      + object   = {
          + apiVersion = "v1"
          + binaryData = (known after apply)
          + data       = {
              + "foo" = "bar"
            }
          + immutable  = (known after apply)
          + kind       = "ConfigMap"
          + metadata   = {
              + annotations                = (known after apply)
              + clusterName                = (known after apply)
              + creationTimestamp          = (known after apply)
              + deletionGracePeriodSeconds = (known after apply)
              + deletionTimestamp          = (known after apply)
              + finalizers                 = (known after apply)
              + generateName               = (known after apply)
              + generation                 = (known after apply)
              + labels                     = (known after apply)
              + managedFields              = (known after apply)
              + name                       = "test-config"
              + namespace                  = "default"
              + ownerReferences            = (known after apply)
              + resourceVersion            = (known after apply)
              + selfLink                   = (known after apply)
              + uid                        = (known after apply)
            }
        }
    }

Plan: 1 to add, 0 to change, 0 to destroy.
kubernetes_manifest.test-configmap: Creating...
kubernetes_manifest.test-configmap: Creation complete after 0s

Apply complete! Resources: 1 added, 0 changed, 0 destroyed.
➜  configmap git:(update-sdk)

[bflad]

Excellent! Going to pull this in today and hopefully we can release v0.6.0 with this 🔜