MM-21626, MM-21627 - Plugin API/Hooks Prometheus instrumentati… (#13825)

* MM-21626,MM-21627 - Plugin API/Hooks Prometheus instrumentation

* Updated einterface mocks

* Fixed supervisor tests

* ignoring golint errors for plugin metrics wrappers

* Making golangci happy

* Using variadic form when generating wrapper code

* Removed artificial delay

* Removed comments from tests

* Renaming plugin wrappers to api/hooks_timer_layer

* updating vendor dir and mod files

* Recording plugin api/hook responses in prometheus

* Updated einterfaces-mocks

* Updating go sum

* Updating go sum

* Fixing conflicts

* More conflicts fixing

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

plugin/client_rpc.go

@@ -108,7 +108,7 @@ var _ plugin.Plugin = &hooksPlugin{}
 var _ Hooks = &hooksRPCClient{}
 
 //
-// Below are specal cases for hooks or APIs that can not be auto generated
+// Below are special cases for hooks or APIs that can not be auto generated
 //
 
 func (g *hooksRPCClient) Implemented() (impl []string, err error) {