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>

vendor/modules.txt

@@ -347,7 +347,13 @@ golang.org/x/tools/go/internal/packagesdriver
 golang.org/x/tools/go/packages
 golang.org/x/tools/go/types/objectpath
 golang.org/x/tools/go/types/typeutil
+golang.org/x/tools/imports
+golang.org/x/tools/internal/fastwalk
+golang.org/x/tools/internal/gopathwalk
+golang.org/x/tools/internal/imports
+golang.org/x/tools/internal/module
 golang.org/x/tools/internal/packagesinternal
+golang.org/x/tools/internal/semver
 # google.golang.org/genproto v0.0.0-20200128133413-58ce757ed39b
 google.golang.org/genproto/googleapis/rpc/status
 # google.golang.org/grpc v1.26.0