feat: support generate echo and gin server with protobuf

[sysulq]

Describe what this PR does / why we need it

Does this pull request fix one issue?

Describe how you did it

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Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #696 (9936589) into master (9357ae1) will decrease coverage by 0.35%.
The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##           master     #696      +/-   ##
==========================================
- Coverage   53.19%   52.85%   -0.35%     
==========================================
  Files         190      192       +2     
  Lines       10329    10389      +60     
==========================================
- Hits         5495     5491       -4     
- Misses       4414     4482      +68     
+ Partials      420      416       -4     

Impacted Files	Coverage Δ
proto/testproto/v1/hello.pb.go	38.81% <ø> (ø)
proto/testproto/v1/hello_echo.pb.go	0.00% <0.00%> (ø)
proto/testproto/v1/hello_gin.pb.go	0.00% <0.00%> (ø)
proto/testproto/v1/hello_grpc.pb.go	41.37% <ø> (ø)
pkg/client/redis/init.go	12.50% <0.00%> (-40.00%)	⬇️
pkg/client/resty/resty.go	77.94% <0.00%> (-10.68%)	⬇️
pkg/core/metric/gauge.go	76.00% <0.00%> (-8.00%)	⬇️
pkg/client/rocketmq/producer.go	51.16% <0.00%> (-1.22%)	⬇️
pkg/registry/etcdv3/registry.go	71.23% <0.00%> (-1.03%)	⬇️
pkg/client/rocketmq/pull_consumer.go	56.02% <0.00%> (-0.81%)	⬇️
... and 15 more

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[sysulq]

goos: darwin
goarch: amd64
pkg: github.com/douyu/jupiter/test/benchmark
cpu: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz
BenchmarkHTTP/HTTP_with_reflect-12         	  102470	     11637 ns/op	    9739 B/op	      75 allocs/op
BenchmarkHTTP/HTTP_with_json-12            	  232111	      4875 ns/op	    7497 B/op	      34 allocs/op
BenchmarkHTTP/HTTP_with_grpc_gateway-12    	   85812	     13892 ns/op	   11322 B/op	     109 allocs/op
BenchmarkHTTP/HTTP_with_echo_gateway-12    	  225024	      5269 ns/op	    7954 B/op	      38 allocs/op
PASS
coverage: [no statements]
ok  	github.com/douyu/jupiter/test/benchmark	5.098s

[sysulq]

goos: darwin
goarch: amd64
pkg: github.com/douyu/jupiter/test/benchmark
cpu: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz
BenchmarkHTTP/HTTP_with_reflect-12         	  102470	     11637 ns/op	    9739 B/op	      75 allocs/op
BenchmarkHTTP/HTTP_with_json-12            	  232111	      4875 ns/op	    7497 B/op	      34 allocs/op
BenchmarkHTTP/HTTP_with_grpc_gateway-12    	   85812	     13892 ns/op	   11322 B/op	     109 allocs/op
BenchmarkHTTP/HTTP_with_echo_gateway-12    	  225024	      5269 ns/op	    7954 B/op	      38 allocs/op
PASS
coverage: [no statements]
ok  	github.com/douyu/jupiter/test/benchmark	5.098s

Add HTTP_with_gin_stdjson_gateway case

goos: darwin
goarch: amd64
pkg: github.com/douyu/jupiter/test/benchmark
cpu: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz
BenchmarkHTTP/HTTP_with_reflect-12         	  100839	     11942 ns/op	    9739 B/op	      75 allocs/op
BenchmarkHTTP/HTTP_with_echo_json-12       	  223934	      5666 ns/op	    7495 B/op	      34 allocs/op
BenchmarkHTTP/HTTP_with_grpc_gateway-12    	   81717	     14571 ns/op	   11321 B/op	     109 allocs/op
BenchmarkHTTP/HTTP_with_echo_stdjson_gateway-12         	  215925	      5575 ns/op	    7952 B/op	      38 allocs/op
BenchmarkHTTP/HTTP_with_echo_protojson_gateway-12       	  128109	      9414 ns/op	    9225 B/op	      68 allocs/op
BenchmarkHTTP/HTTP_with_gin_stdjson_gateway-12          	  178164	      7200 ns/op	    8280 B/op	      46 allocs/op
PASS
coverage: [no statements]
ok  	github.com/douyu/jupiter/test/benchmark	8.791s