[js-api-parser] add interface generator

[KarishmaGhiya]

• adding interface generator

[Copilot]

Pull request overview

This PR adds an interface token generator to the js-api-parser tool, enabling the APIView parser to process TypeScript interface declarations. The implementation follows the existing pattern established by enum and function generators, with comprehensive test coverage.

Key Changes:

• Adds interface token generator with support for type parameters, constraints, and heritage clauses
• Refactors shared helper functions from the function generator into a common helpers module
• Includes extensive test coverage with 18 test cases covering various interface scenarios

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tools/apiview/parsers/js-api-parser/src/tokenGenerators/interfaces.ts	New interface token generator implementation that handles interface declarations with type parameters and extends clauses
tools/apiview/parsers/js-api-parser/test/tokenGenerators/inteface.spec.ts	Comprehensive test suite for the interface generator (note: filename has typo)
tools/apiview/parsers/js-api-parser/src/tokenGenerators/helpers.ts	New shared helper module containing common token creation and processing utilities
tools/apiview/parsers/js-api-parser/src/tokenGenerators/function.ts	Refactored to use shared helpers, with cleaner type parameter access
tools/apiview/parsers/js-api-parser/src/tokenGenerators/index.ts	Updated to register the new interface generator and fix formatting

[maorleger]

This looks good to me I think, @jeremymeng any concerns?

Would be good to see the diff in APIView staging for a few libraries... coming along well and I love how the refactor is broken down to small chunks!

[jeremymeng]

Looks good!

[maorleger]

Just wanted to flag the missing default type - let me know when I should review again 👍

[maorleger]

🚀