dart-lang / native / 13907892100

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[native_assets_cli] Separate out `json_syntax_generator` into separate package (#2101)

Bug: https://github.com/dart-lang/native/issues/1826

This refactors `package:hook`s `tool/generate_syntax.dart`.

* Moved into its own package `package:json_syntax_generator`.
* Documented the feature set: optional/required fields, subclassing, tagged unions, and enums.
* Refactored from a single-pass code generator, to a two step pipeline. (1) analyze the JSON schema and extra into a data structure, (2) generate code from the data structure.
* Sprinkled comments about the "why" on the most important classes and fields.

This PR is intended to be a NOP w.r.t. the syntax that's generated. (Some whitespace and `toString` changes.)

Having this as a separate package will enable us to reuse it for the syntax in different places. For now, we're not intending to publish it, instead we can use it as a git dependency in the dev dependencies (or we publish it unlisted). @mosuem Please let me know if it is possible for you to generate the syntax for the `FontAsset`s.

Open issue:

* The generated code requires a `utils/json.dart`. We should make the generated code be standalone. I'll do that in a follow up PR.

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