Rewrite request header gateway filter factory

[aburmeis]

Add a new filter factory to rewrite request headers fixing #2353

[codecov]

Codecov Report

Merging #2391 (456f51e) into main (8d95340) will increase coverage by 1.05%.
The diff coverage is 93.93%.

@@             Coverage Diff              @@
##               main    #2391      +/-   ##
============================================
+ Coverage     78.63%   79.68%   +1.05%     
- Complexity     1347     1371      +24     
============================================
  Files           172      173       +1     
  Lines          5101     5129      +28     
  Branches        434      436       +2     
============================================
+ Hits           4011     4087      +76     
+ Misses          866      830      -36     
+ Partials        224      212      -12     

Impacted Files	Coverage Δ
...tory/RewriteRequestHeaderGatewayFilterFactory.java	91.66% <91.66%> (ø)
...ringframework/cloud/gateway/mvc/ProxyExchange.java	66.27% <100.00%> (ø)
...cloud/gateway/sample/GatewaySampleApplication.java	87.35% <100.00%> (ø)
...cloud/gateway/config/GatewayAutoConfiguration.java	83.42% <100.00%> (+0.09%)	⬆️
...ateway/filter/headers/XForwardedHeadersFilter.java	85.21% <100.00%> (+0.26%)	⬆️
...teway/route/InMemoryRouteDefinitionRepository.java	100.00% <100.00%> (+30.76%)	⬆️
...eway/filter/factory/RetryGatewayFilterFactory.java	78.36% <0.00%> (-0.59%)	⬇️
...ework/cloud/gateway/filter/NettyRoutingFilter.java	89.13% <0.00%> (+3.26%)	⬆️
...loud/gateway/filter/WeightCalculatorWebFilter.java	92.30% <0.00%> (+3.84%)	⬆️
...y/handler/predicate/PathRoutePredicateFactory.java	86.27% <0.00%> (+5.88%)	⬆️
... and 8 more

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