Add missing APIs needed by typescript-eslint - #64264

Adds native TypeScript API parity required by typescript-eslint and aligns JSX enum values with Strada.

Changes:

• Adds checker, signature, index, and interface-this APIs.
• Adds sync/async API parity tests and protocol support.
• Corrects JsxEmit.React and ReactNative values.

Files not reviewed (1)

• tsc/internal/api/enum_values_generated.go: Generated file

Suppressed comments (2)

packages/typescript/src/api/async/api.ts:1809

• The public parameter is broader than the operation supports. Expression allows identifiers, literals, and other non-call nodes, but the backend passes this node to resolveSignature, whose default case panics for anything outside CallLikeExpression (tsc/internal/checker/checker.go:8620-8635). The classic API contract is also CallLikeExpression (tsc/testdata/fixtures/compiler/types.ts:5230). Please narrow this parameter in the async source and regenerate the sync API so a type-correct client call cannot crash the server.

            positions: positionOrPositions,

packages/typescript/src/api/async/api.ts:2104

• The stated parity scope still omits TypeChecker.getTypeOfPropertyOfType, which the linked typescript-eslint PR lists among the required recreated APIs. The Go checker already exposes the primitive at tsc/internal/checker/exports.go:263-265, but there is no protocol or async/sync client method, so consumers still cannot use it through this API. Please expose it alongside these checker methods and cover it in the parity tests.

    async getReturnTypeOfSignature(signature: Signature): Promise<Type> {

• Files reviewed: 22/23 changed files
• Comments generated: 0
• Review effort level: Balanced

Files not reviewed (1)

• tsc/internal/api/enum_values_generated.go: Generated file

Suppressed comments (1)

tsc/internal/api/session.go:4084

• This path does not fully match classic Signature.getDocumentationComment() inheritance: a derived method with an empty JSDoc or @inheritDoc has a local JSDoc node, so getJSDocOrTag stops there and this returns an empty comment instead of the base method's documentation. Please explicitly fall back to/merge base declaration documentation when the local result is empty or contains @inheritDoc, and cover that case in the parity tests.

	return ls.GetDocumentationComment(setup.checker, []*ast.Node{signature.Declaration()}), nil

• Files reviewed: 22/23 changed files
• Comments generated: 1
• Review effort level: Balanced

Files not reviewed (1)

• tsc/internal/api/enum_values_generated.go: Generated file

• Files reviewed: 22/23 changed files
• Comments generated: 0 new
• Review effort level: Balanced