Add support for ClientSideWeightedRoundRobin LB policy

[anton-kuklin]

Fixes https://github.com/projectcontour/contour/issues/6998

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[anton-kuklin]

CC: @davinci26 @clayton-gonsalves @seth-epps @shadialtarsha @gregbarasch

[codecov[bot]]

Codecov Report

:x: Patch coverage is 94.02985% with 8 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 80.81%. Comparing base (cdf2738) to head (049fa51). :warning: Report is 166 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/dag/extension_processor.go	42.85%	3 Missing and 1 partial :warning:
internal/dag/httpproxy_processor.go	42.85%	3 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6999      +/-   ##
==========================================
+ Coverage   80.72%   80.81%   +0.08%     
==========================================
  Files         131      131              
  Lines       19868    19996     +128     
==========================================
+ Hits        16039    16159     +120     
- Misses       3537     3543       +6     
- Partials      292      294       +2     

Files with missing lines	Coverage Δ
internal/dag/dag.go	98.78% <ø> (ø)
internal/dag/policy.go	96.02% <100.00%> (+0.34%)	:arrow_up:
internal/envoy/v3/cluster.go	96.97% <100.00%> (+0.66%)	:arrow_up:
internal/dag/extension_processor.go	93.87% <42.85%> (-2.56%)	:arrow_down:
internal/dag/httpproxy_processor.go	90.76% <42.85%> (-0.24%)	:arrow_down:

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