feat: add dev server and health (#2665)

* feat: add dev server and health

* fix: fix ci

* fix: fix comment.

* feat: add enabled

* remove no need test

* feat: mv devServer to internal

* feat: default enable pprof

Co-authored-by: dylan.wang <dylan.wang@yijinin.com>

internal/devserver/config.go

@@ -0,0 +1,12 @@
+package devserver
+
+// Config is config for inner http server.
+type Config struct {
+	Enabled       bool   `json:",default=true"`
+	Host          string `json:",optional"`
+	Port          int    `json:",default=6470"`
+	MetricsPath   string `json:",default=/metrics"`
+	HealthPath    string `json:",default=/healthz"`
+	EnableMetrics bool   `json:",default=true"`
+	EnablePprof   bool   `json:",default=true"`
+}