Feat: cors policy implement

[MasterKenway]

• Implement cors policy defined in the HttpConnectionManage

• Style unified

[codecov-commenter]

Codecov Report

Merging #249 (bafddfb) into develop (efae1be) will not change coverage.
The diff coverage is 33.84%.

@@           Coverage Diff            @@
##           develop     #249   +/-   ##
========================================
  Coverage    40.93%   40.93%           
========================================
  Files           51       51           
  Lines         2587     2587           
========================================
  Hits          1059     1059           
  Misses        1415     1415           
  Partials       113      113           

Impacted Files	Coverage Δ
pkg/common/extension/filter/filter_manager.go	58.82% <0.00%> (ø)
pkg/context/http/context.go	6.81% <ø> (ø)
pkg/filter/response/response.go	34.17% <0.00%> (ø)
pkg/server/http.go	0.00% <0.00%> (ø)
pkg/server/listener.go	0.00% <0.00%> (ø)
pkg/filter/accesslog/access_log.go	6.15% <16.66%> (ø)
pkg/filter/host/host.go	43.75% <28.57%> (ø)
pkg/filter/metric/metric.go	64.70% <37.50%> (ø)
pkg/filter/recovery/recovery.go	56.52% <42.85%> (ø)
pkg/filter/header/header.go	66.66% <50.00%> (ø)
... and 3 more

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[mark4z]

LGTM