feat(gateway): support URL rewriting

[michaelbeaumont]

Summary

Closes #4179, closes #3908

Needs subsequent docs PR hint about experimental added to kumahq/kuma-website#895

[codecov-commenter]

Codecov Report

Merging #4638 (72b245d) into master (589eb10) will decrease coverage by 0.19%.
The diff coverage is 4.22%.

@@            Coverage Diff             @@
##           master    #4638      +/-   ##
==========================================
- Coverage   46.57%   46.38%   -0.20%     
==========================================
  Files         684      684              
  Lines       46323    46522     +199     
==========================================
+ Hits        21576    21580       +4     
- Misses      22834    23028     +194     
- Partials     1913     1914       +1     

Impacted Files	Coverage Δ
...plugins/runtime/gateway/gateway_route_generator.go	94.07% <0.00%> (-5.93%)	⬇️
pkg/plugins/runtime/gateway/route/table.go	100.00% <ø> (ø)
...8s/controllers/gatewayapi/http_route_conversion.go	0.00% <0.00%> (ø)
api/mesh/v1alpha1/gateway_route.pb.go	3.33% <4.13%> (+<0.01%)	⬆️
pkg/plugins/runtime/gateway/route/configurers.go	70.02% <14.28%> (-3.71%)	⬇️
...g/plugins/runtime/gateway/route_table_generator.go	81.30% <100.00%> (+0.17%)	⬆️
pkg/xds/cache/once/cache.go	82.05% <0.00%> (-12.83%)	⬇️
pkg/xds/cache/once/once.go	95.00% <0.00%> (-5.00%)	⬇️
pkg/core/resources/manager/cache.go	85.71% <0.00%> (-2.60%)	⬇️
pkg/xds/generator/direct_access_proxy_generator.go	90.90% <0.00%> (+1.13%)	⬆️
... and 1 more

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[lukidzi]

LGTM