[release/6.0-preview5] Add JSON source-gen mode that emits serialization logic #53337
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Backport of #53212 to release/6.0-preview5. Contributes to #51945.
/cc @layomia
Customer Impact
This PR adds a new mode to the JSON source generator that emits serialization logic and can improve throughput performance. It is important to have folks try it and give us feedback.
We discussed with ASP.NET - they are supportive of this and don't need to react to the change.
Testing
Tests have been added for new scenarios and there are no regressions to existing tests.
Risk
The risk is minimal. Projects using System.Text.Json without JSON source gen should be unaffected since the vast majority of changes are within the source generator. Projects that use source gen should also have no regressions to existing functionality, and it will be easy to configure the new mode.