(#1554) Add support for all common compressions (write and read)

- Remove the context.Context interface and export the *context, the iris.Context now points to the pointer\nSupport compression and rate limiting in the FileServer\nBit of code organisation


Former-commit-id: ad1c61bf968059510c6be9e7f2cceec7da70ba17

cache/client/ruleset.go

@@ -28,6 +28,6 @@ var DefaultRuleSet = rule.Chained(
 
 // NoCache disables the cache for a particular request,
 // can be used as a middleware or called manually from the handler.
-func NoCache(ctx context.Context) {
+func NoCache(ctx *context.Context) {
 	ctx.Header(cfg.NoCacheHeader, "true")
 }