Move request package into public/shared folder (#24420)

* move request package to public/shared

* updated app-layers

* update app layer

* remove original package location

server/channels/app/layer_generators/opentracing_layer.go.tmpl

@@ -8,6 +8,7 @@ package opentracing
 
 import (
 	"github.com/opentracing/opentracing-go/ext"
+
 	spanlog "github.com/opentracing/opentracing-go/log"
 )
 
@@ -140,4 +141,4 @@ func (a *{{.Name}}) Timezones() *timezones.Timezones {
 }
 func (a *{{.Name}}) SetServer(srv *app.Server) {
        a.srv = srv
-}
+}