Add support for printing dictionaries when using custom scalars

[patrick91]

This PR add support for printing dictionaries as default values, for example:

@strawberry.input
class MyInput:
    j: JSON = strawberry.field(default_factory=dict)
    j2: JSON = strawberry.field(default_factory=lambda: {"hello": "world"})

@strawberry.type
class Query:
    @strawberry.field
    def search(self, input: MyInput) -> JSON:
        return input.j

will print the following

input MyInput {
    j: JSON! = {}
    j2: JSON! = {hello: "world"}
}

type Query {
    search(input: MyInput!): JSON!
}

Here's an example of this working in another server: https://codesandbox.io/s/apollo-json-default-value-4mkreh?file=/index.js:0-899

TODO:

• allow nested dictionaries
• this, but also for arguments

Description

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Documentation

[codecov]

Codecov Report

Merging #2048 (047cbbb) into main (46f5f59) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2048      +/-   ##
==========================================
+ Coverage   98.03%   98.05%   +0.02%     
==========================================
  Files         145      147       +2     
  Lines        5797     5874      +77     
  Branches     1080     1107      +27     
==========================================
+ Hits         5683     5760      +77     
  Misses         58       58              
  Partials       56       56              

[botberry]

Thanks for adding the RELEASE.md file!

Here's a preview of the changelog:

---

This release adds support for printing default values for scalars like JSON.

For example the following:

import strawberry
from strawberry.scalars import JSON


@strawberry.input
class MyInput:
    j: JSON = strawberry.field(default_factory=dict)
    j2: JSON = strawberry.field(default_factory=lambda: {"hello": "world"})

will print the following schema:

input MyInput {
    j: JSON! = {}
    j2: JSON! = {hello: "world"}
}

Here's the tweet text:

🆕 Release (next) is out! Thanks to @patrick91 for the PR 👏

Get it here 👉 https://github.com/strawberry-graphql/strawberry/releases/tag/(next)

[patrick91]

@BryceBeagle I'll merge this since I need it for the federation 2.0 fixes (#2047)

I'll open an issue about rewriting the printer 😊