feat(typescript): Parse pagination headers in API responses #SCD-665

[jablan]

phrase/phrase-js#19

Parses pagination and link headers from API response and exposes them as convenience functions.

In order to keep the backwards compatibility, we can't alter high level API functions, but only raw ones instead.

[Copilot]

Pull request overview

This PR adds pagination metadata parsing from API response headers, exposing pagination information through the raw API methods while maintaining backward compatibility with high-level API functions.

Key changes:

• Extended ApiResponse interface and JSONApiResponse class to include pagination properties (isPaginated, hasNextPage, nextPage, nextPageUrl, totalCount, totalPages)
• Implemented header parsing logic in the constructor to extract pagination data from Link and Pagination headers
• Added comprehensive test coverage for the new pagination functionality

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
openapi-generator/templates/typescript-fetch/runtime.mustache	Adds pagination properties to ApiResponse interface and implements parsing logic in JSONApiResponse constructor
clients/typescript/tests/BasicApiTest.ts	Updates mock fetch helper to support headers and adds new test suite for localesListRaw with pagination assertions

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