[record_use] Generate syntax

[dcharkes]

This PR:

• Introduces a bunch of test data. Partially copied from the Dart SDK expect files, partially handwritten.
• Introduces a JSON schema for the record use files.
• Removes the handwritten JSON parsing/unparsing and introduces a generated syntax.
• Extends the JSON syntax generator to cover some new types.
  (Such as List<int?> where the nullability comes from the type in the JSON schema being defined as a ["integer", "null"] rather than "integer" and the field in the dictionary being non-required.)

Bug: #2681

This PR does not:

• Change the JSON format.
  • The current format does not support certain consts.
  • Has inconsistencies with casing
  • And mixes class definitions and method definitions together leading to fields that are nullable in places where they shouldn't.
    I have filed issues in [record_use] Correctness: ☂️ JSON format #1093.
• Author the public API surface. (The JSON methods on the individual classes do not need to be part of the public API.)

[github-actions]

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
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pkgs/hooks_runner/test_data/download_assets/hook/build.dart
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Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
hooks	None	1.0.0	1.0.0	1.0.0	✔️
record_use	Breaking	0.4.2	0.5.0-wip	0.5.0	✔️

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[mosuem]

I personally like shows, makes it easier to grep which symbols are where. I am trying to use them by default everywhere now.

[dcharkes]

That sounds like a lot of manual churn if we don't have (a) a lint to enforce it, and (2) the auto-import features in the IDE use that, and (3) have auto-fixes.

Opt me in when we have it effortless!

It might also help with analyzer speed in our projects! 🥳

[mosuem]

Yeah I also would love a lint for this... @bwilkerson ;)

[coveralls]

coverage: 80.487% (-11.6%) from 92.127%
when pulling 57a1778 on record-use-syntax
into 4341e37 on main.

[coveralls]

coverage: 80.568% (-11.6%) from 92.127%
when pulling fba73e8 on record-use-syntax
into 4341e37 on main.