New report router and user reporting refactoring (#25713)

* Added materialized view migration

* Renamed mat view

* Added channel membership mat view and indexes

* Added channel membership mat view and indexes

* Added new index

* WIP

* Simplifying user reporting code

* Created app and API layer for cahnnel reporting, reporting refactoring in general

* New router

* Remobved channel reporting meanwhile

* Upodated autogenerated stuff

* Lint fix

* Fixed typo

* api vet

* i18n fix

* Fixed API vetting and removed channel reporting constants

* yaml

* removed app pagination tests

server/channels/api4/api.go

@@ -139,6 +139,8 @@ type Routes struct {
 	Drafts *mux.Router // 'api/v4/drafts'
 
 	IPFiltering *mux.Router // 'api/v4/ip_filtering'
+
+	Reports *mux.Router // 'api/v4/reports'
 }
 
 type API struct {
@@ -265,6 +267,8 @@ func Init(srv *app.Server) (*API, error) {
 
 	api.BaseRoutes.IPFiltering = api.BaseRoutes.APIRoot.PathPrefix("/ip_filtering").Subrouter()
 
+	api.BaseRoutes.Reports = api.BaseRoutes.APIRoot.PathPrefix("/reports").Subrouter()
+
 	api.InitUser()
 	api.InitBot()
 	api.InitTeam()
@@ -309,6 +313,7 @@ func Init(srv *app.Server) (*API, error) {
 	api.InitHostedCustomer()
 	api.InitDrafts()
 	api.InitIPFiltering()
+	api.InitReports()
 
 	srv.Router.Handle("/api/v4/{anything:.*}", http.HandlerFunc(api.Handle404))