attach and export real handler for request

[SUDOCS]

record user defined handler to request object before executing middlewares, which makes it possible to do something special according to the final target router in handler.

#2217

[codecov-commenter]

Codecov Report

Base: 76.57% // Head: 76.50% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (fd0d00a) compared to base (8e0e878).
Patch coverage: 76.47% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2220      +/-   ##
==========================================
- Coverage   76.57%   76.50%   -0.07%     
==========================================
  Files         580      582       +2     
  Lines       48281    48404     +123     
==========================================
+ Hits        36969    37033      +64     
- Misses       9290     9341      +51     
- Partials     2022     2030       +8     

Flag	Coverage Δ
go-1.15-386	76.49% <76.47%> (?)
go-1.15-amd64	76.50% <76.47%> (-0.03%)	⬇️
go-1.16-386	76.49% <76.47%> (-0.03%)	⬇️
go-1.16-amd64	76.54% <76.47%> (+0.04%)	⬆️
go-1.17-386	76.52% <76.47%> (+<0.01%)	⬆️
go-1.17-amd64	76.54% <76.47%> (?)
go-1.18-386	76.47% <76.47%> (?)
go-1.18-amd64	76.43% <76.47%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
net/ghttp/ghttp.go	100.00% <ø> (ø)
net/ghttp/ghttp_request.go	83.45% <0.00%> (-1.28%)	⬇️
net/ghttp/ghttp_server_router_serve.go	76.92% <81.81%> (+0.12%)	⬆️
net/ghttp/ghttp_request_middleware.go	82.72% <100.00%> (ø)
net/ghttp/ghttp_server_handler.go	63.60% <100.00%> (ø)
net/ghttp/ghttp_server_router_hook.go	92.75% <100.00%> (ø)
contrib/config/kubecm/kubecm.go	38.38% <0.00%> (ø)
contrib/config/kubecm/kubecm_kube.go	100.00% <0.00%> (ø)
os/gcache/gcache_adapter_memory_lru.go	97.82% <0.00%> (+8.69%)	⬆️

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