feat: Added fetchRequestInitGenerator option

[grijeshsaini]

--

In scenarios where elements contain multiple URLs, including both internal and public links, there arises a need to supply distinct RequestInit configurations for various fetch requests.

Presently, the limitation lies in the fact that we can only provide a single fetchRequestInit, and this configuration is globally applied to all fetch calls for that element.

This proposed feature aims to enhance flexibility by enabling the provision of RequestInit configurations tailored to individual fetch requests based on their respective URLs. This enhancement ensures more granular control over the customization of fetch request behaviors, facilitating better handling of internal and public URLs.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Enhancement (changes that improvement of current feature or performance)
• [ ] Refactoring (changes that neither fixes a bug nor adds a feature)
• [ ] Test Case (changes that add missing tests or correct existing tests)
• [ ] Code style optimization (changes that do not affect the meaning of the code)
• [ ] Docs (changes that only update documentation)
• [ ] Chore (changes that don't modify src or test files)

Self Check before Merge

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[vivcat[bot]]

👋 @grijeshsaini

💖 Thanks for opening this pull request! 💖

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[codecov[bot]]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (b751cbf) 62.93% compared to head (7aee57e) 63.10%. Report is 4 commits behind head on master.

Files	Patch %	Lines
src/embed-webfonts.ts	0.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #443 +/- ## ========================================== + Coverage 62.93% 63.10% +0.17% ========================================== Files 10 10 Lines 580 580 Branches 143 143 ========================================== + Hits 365 366 +1 Misses 151 151 + Partials 64 63 -1 ```

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