✨ v3 (feature): add support for custom constraints

[efectn]

Description

This pull requests add support for registering external constraints to fiber.
Fixes #2783

Changes Introduced

• Benchmarks: Describe any performance benchmarks and improvements related to the changes.
• Documentation Update: Detail the updates made to the documentation and links to the changed files.
• Changelog/What's New: Include a summary of the additions for the upcoming release notes.
• Migration Guide: If necessary, provide a guide or steps for users to migrate their existing code to accommodate these changes.
• API Alignment with Express: Explain how the changes align with the Express API.
• API Longevity: Discuss the steps taken to ensure that the new or updated APIs are consistent and not prone to breaking changes.
• Examples: Provide examples demonstrating the new features or changes in action.

Type of Change

• New feature (non-breaking change which adds functionality)
• Enhancement (improvement to existing features and functionality)
• Documentation update (changes to documentation)

Checklist

• Conducted a self-review of the code and provided comments for complex or critical parts.
• Updated the documentation in the /docs/ directory for Fiber's documentation.
• Added or updated unit tests to validate the effectiveness of the changes or new features.

Commit Formatting

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[ReneWerner87]

big thx
will review it tomorrow morning, it's on my list

[sixcolors]

You might want to consider some of the comments, but overall, everything LGTM!

[ReneWerner87]

LGTM

[ReneWerner87]

@efectn could you also fix the lint hints

[ReneWerner87]

just a bench is missing, after this, i will merge