perf: optimize the http.ContentType method #6143

Job	Run time
resolve module	3s
lint module (./contrib/encoding/msgpack)	22s
lint module (./contrib/polaris)	30s
lint module (./contrib/log/aliyun)	22s
lint module (./contrib/log/tencent)	18s
lint module (./contrib/log/logrus)	17s
lint module (./contrib/log/zap)	22s
lint module (./contrib/log/zerolog)	11s
lint module (./contrib/log/fluent)	18s
lint module (./contrib/registry/consul)	21s
lint module (./contrib/registry/eureka)	26s
lint module (./contrib/registry/polaris)	27s
lint module (./contrib/registry/nacos)	24s
lint module (./contrib/registry/etcd)	23s
lint module (./contrib/registry/kubernetes)	58s
lint module (./contrib/registry/servicecomb)	16s
lint module (./contrib/registry/zookeeper)	10s
lint module (./contrib/registry/discovery)	16s
lint module (./contrib/config/consul)	22s
lint module (./contrib/config/apollo)	28s
lint module (./contrib/config/polaris)	34s
lint module (./contrib/config/nacos)	27s
lint module (./contrib/config/etcd)	23s
lint module (./contrib/config/kubernetes)	40s
lint module (./contrib/opensergo)	20s
lint module (./contrib/errortracker/sentry)	26s
lint module (./cmd/protoc-gen-go-errors)	18s
lint module (./cmd/kratos)	19s
lint module (./cmd/protoc-gen-go-http)	22s
lint module (.)	34s
	11m 37s

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