feat: allow more compressor overrides

[buroa]

This adds a new chooseFirst and removeAcceptEncodingHeader to each compressor.

When chooseFirst is true, the compressor is preferred when q-values in Accept-Encoding are equal. If multiple compressor filters set choose_first to true, the last one in the filter chain is chosen.

When removeAcceptEncodingHeader is true, removes Accept-Encoding from the request headers before dispatching the request to the upstream so that responses do not get compressed before reaching the filter.

I also clean up some of the code in various places. There was some duplication happening.

Note: These are currently only offered as a "global" setting as chooseFirst is not overridable per route, so I made both like that.

Closes #5796

[codecov]

Codecov Report

❌ Patch coverage is 86.95652% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.37%. Comparing base (1e295b6) to head (587d9a5).

Files with missing lines	Patch %	Lines
internal/xds/translator/compressor.go	71.42%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7406      +/-   ##
==========================================
+ Coverage   72.36%   72.37%   +0.01%     
==========================================
  Files         231      231              
  Lines       34042    34011      -31     
==========================================
- Hits        24633    24617      -16     
+ Misses       7633     7623      -10     
+ Partials     1776     1771       -5     

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[zirain]

thinking this loud, should we move 19001 to dynamic listener
cc @envoyproxy/gateway-maintainers

[buroa]

/retest

[buroa]

/retest

[buroa]

@arkodg Can I get a review please? :-)