feat: starlette extension

[tandemdude]

Summary

Checklist

• I have run nox and all the pipelines have passed.

• I have created a changelog fragment to describe this change

Related issues

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 15 lines in your changes missing coverage. Please review.

Project coverage is 90.30%. Comparing base (d1bd535) to head (93bb41c).
Report is 2 commits behind head on master.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
linkd/ext/starlette.py	60.52%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
- Coverage   92.13%   90.30%   -1.83%     
==========================================
  Files          11       13       +2     
  Lines         572      619      +47     
==========================================
+ Hits          527      559      +32     
- Misses         45       60      +15     

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