fix(api_gateway): allow whitespace in routes' path parameter

[sthuber90]

Issue number: #1098

Summary

Changes

Please provide a summary of what's being changed

Updated the _UNSAFE_URI constant to support whitespace in path parameter

User experience

Please share what the user experience looks like before and after this change

User facing nothing changed

Checklist

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• Meet tenets criteria
• I have performed a self-review of my this change
• Changes are tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[boring-cyborg]

Thanks a lot for your first contribution! Please check out our contributing guidelines and don't hesitate to ask whatever you need.

[codecov-commenter]

Codecov Report

Merging #1099 (9208667) into develop (8c4eca0) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1099   +/-   ##
========================================
  Coverage    99.96%   99.96%           
========================================
  Files          119      119           
  Lines         5378     5378           
  Branches       613      613           
========================================
  Hits          5376     5376           
  Partials         2        2           

Impacted Files	Coverage Δ
aws_lambda_powertools/event_handler/api_gateway.py	100.00% <100.00%> (ø)

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[sthulb]

@sthuber90 Mind creating a separate test out the tests? So there's a separate test for whitespace checks? Want to make sure that the tests are easy to spot if we get a regression in the future

[sthuber90]

Sure, will do

[boring-cyborg]

Awesome work, congrats on your first merged pull request and thank you for helping improve everyone's experience!