Vedant224

feat: add deprecation warnings for invalid sendStatus parameters to prepare for Express v6

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## Summary Implements deprecation warnings for invalid status codes passed to `res.sendStatus()`, as recommended by maintainers. This provides a smooth migration path from the current throwing behavior to stricter validation...

Fix: Add type validation for sendStatus to prevent BigInt serialization error (#6756)

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Fixes #6756 This PR adds type validation to `res.sendStatus()` to prevent uncaught TypeError when BigInt values are passed as status codes. **Problem:** - `res.sendStatus(200n)` caused uncaught `"Do not know how...