MM-25095: Handles static JS and CSS using Brotli encoding. (#14524)

* MM-25095: Handles static JS and CSS files using Brotli.

* MM-25095: Linting fix.

* MM-25095: Adds missing license.

* MM-25095: Moves initialization of slice.

* MM-25095: Moves initialization of slice.

vendor/github.com/NYTimes/gziphandler/go.mod

@@ -1,5 +0,0 @@
-module github.com/NYTimes/gziphandler
-
-go 1.11
-
-require github.com/stretchr/testify v1.3.0