Commits on Nov 18, 2022

1. internal/fwschema: Add NestedAttributeObject and NestedBlockObject in… …

   …terfaces
   
   Reference: #132
   Reference: #508
   Reference: #532
   
   Since the initial version of the framework, it has treated nested attributes and blocks as a singular entity with some internal gynastics to handle the one (single; object) or two (list, map, set to object) actual types that make up the nested attribute or block. Having these schema abstractions as single entities caused developer confusion when attempting to extract data or create paths.
   
   Other desirable features for the framework are the ability to customize the types, define validators, and define plan modifiers of nested attributes and blocks. This type customization, validation, or plan modification may need to be on the nested object to simplify provider implementations. Exposing these options with a flat abstraction could be confusing.
   
   This change introduces the concept of a nested attribute object and a nested block object into the `internal/fwschema` package and makes the necessary implementation changes to `tfsdk.Attribute` and `tfsdk.Block`. While the `tfsdk` package schema handling does not expose the new potential enhancements, the upcoming `datasource`, `provider`, and `resource` schema handling will. The existing unit testing shows no regressions and the new unit tests with validation show it should be possible to implement nested object validation (and when implemented in the near future, plan modification).
   
   This changeset additionally migrates more `tfsdk.Schema` logic into the `internal/fwschema` package in further preparation for creating additional schema implementations that will benefit from the existing schema logic.

   

   bflad committed Nov 18, 2022
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