SF-3513 Add pre-compressed Brotli support to Kestrel

[pmachapman]

This PR adds Brotli support to Kestrel, as Apache passes static file requests straight through to Kestrel.

The easiest place to test is QA, but if you want to test locally, run the Docker image:

dotnet build
cd src/Docker
docker compose build
docker compose up

Accessing Scripture Forge, and viewing network requests for static files will confirm that Brotli compressed versions are returned.

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This change is 

[codecov]

Codecov Report

❌ Patch coverage is 1.56250% with 63 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.32%. Comparing base (5132e3a) to head (0590fe2).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/SIL.XForge.Scripture/Startup.cs	1.56%	63 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3722      +/-   ##
==========================================
- Coverage   81.45%   81.32%   -0.13%     
==========================================
  Files         620      620              
  Lines       38960    39023      +63     
  Branches     6336     6341       +5     
==========================================
+ Hits        31734    31735       +1     
- Misses       6256     6318      +62     
  Partials      970      970              

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[pmachapman]

@pmachapman resolved 1 discussion and dismissed @github-advanced-security[bot] from a discussion.
Reviewable status: 0 of 3 files reviewed, all discussions resolved.

[RaymondLuong3]

This is working from my testing. The static files are compressed to the br format.

@RaymondLuong3 reviewed 3 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on pmachapman).