Fix mypy warnings in router.py

[dave42w]

Description

This PR fixes most of the mypy warnings in router.py

Summary

This PR does not fix https://github.com/sparckles/Robyn/issues/1035 where add_route is inconsistent between the BaseRouter(ABC) and it's subclasses.

The biggest changes were in Router. _format_response

• fixing re-use of local variable names but with a different type
• using if "x" in headers replaced with if headers.contains("x")
• missing type specifiers

Beyond that a few places with a missing dict type: for injected_dependencies x 2 and self.reoutes x 1

PR Checklist

Please ensure that:

• [x ] The PR contains a descriptive title
• [x ] The PR contains a descriptive summary of the changes
• [x ] You build and test your changes before submitting a PR.
• [x ] You have added relevant documentation
• [ x] You have added relevant tests. We prefer integration tests wherever possible

Pre-Commit Instructions:

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Name	Status	Preview	Comments	Updated (UTC)
robyn	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 20, 2024 10:46pm

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #1038 will not alter performance

_{Comparing dave42w:mypy2 (be555e7) with main (3f2e79a)}

Summary

✅ 146 untouched benchmarks