Chore: replace macaron with web package (#40136)

* replace macaron with web package

* add web.go

pkg/middleware/rate_limit.go

@@ -3,10 +3,9 @@ package middleware
 import (
 	"time"
 
-	"golang.org/x/time/rate"
-	"gopkg.in/macaron.v1"
-
 	"github.com/grafana/grafana/pkg/models"
+	"github.com/grafana/grafana/pkg/web"
+	"golang.org/x/time/rate"
 )
 
 type getTimeFn func() time.Time
@@ -14,7 +13,7 @@ type getTimeFn func() time.Time
 // RateLimit is a very basic rate limiter.
 // Will allow average of "rps" requests per second over an extended period of time, with max "burst" requests at the same time.
 // getTime should return the current time. For non-testing purposes use time.Now
-func RateLimit(rps, burst int, getTime getTimeFn) macaron.Handler {
+func RateLimit(rps, burst int, getTime getTimeFn) web.Handler {
 	l := rate.NewLimiter(rate.Limit(rps), burst)
 	return func(c *models.ReqContext) {
 		if !l.AllowN(getTime(), 1) {