Add proper typing for cdn/links endpoint and include_dates parameter

[edodusi]

Pull request type

Fixes: #909

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Other (please describe):

How to test this PR

1. Install dependencies and run tests:

pnpm install
pnpm test

2. Try using the cdn/links endpoint with TypeScript:

const { data } = await storyblokApi.get('cdn/links', {
  version: 'draft',
  include_dates: 1
});
// TypeScript should properly recognize all fields including dates
console.log(data.links['some-uuid'].created_at);

3. Verify that other endpoints still work as expected with their original types.

What is the new behavior?

• Added proper typing for cdn/links endpoint parameters through ISbLinksParams interface
• Added ISbLinkWithDates interface to include date fields when include_dates is set
• Implemented function overloads for the get method to provide correct typing based on the endpoint
• Added comprehensive test suite covering various edge cases and scenarios
• TypeScript now correctly validates:
  • The include_dates parameter for cdn/links endpoint
  • Date fields (created_at, updated_at, published_at) when include_dates is used
  • Proper return types for both cdn/links and other endpoints

Other information

This PR fixes the typing issues with the cdn/links endpoint while maintaining backward compatibility with existing code. All changes are type-level only, with no runtime behavior modifications.

[bevanmw]

Awesome! Thanks @edodusi

[github-actions]

🎉 This PR is included in version 6.10.6 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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