MM-45317: global drafts endpoints and ws events (#20614)

* MM-23881: global drafts endpoints and ws events

Adds endpoints:
- create/update drafts
- delete draft
- get drafts

Adds WS events:
- draft_updated
- draft_created
- draft_deleted

* Ordering and WS event name fixes

* Adds PostID to the drafts table

In the future the drafts will include edited posts, this commit adds the
post id in the combined pkey of the table.

* Fixes route for deleting a thread draft

* Fixes failed checks

* Fixes migrations

* Fixes migration

* Extract translation strings

* Removes PostID since we won't sync editing posts

* Fixes tests

* Fixes i18n

* Update migrations for global drafts

* update branch with latest master changes

* Add feature flag for global drafts

* Set global drafts feature flag default to true

* Added support for files in drafts

* Fix failing i18n check

* Added support for deleting files in drafts

* Revert "Added support for deleting files in drafts"

This reverts commit 45dfd04a760359de2e8814d652c9ef46daf994f6.

* Triggering new test server

* Add config setting 'AllowSyncedDrafts' for syncing drafts with server

* Triggering new test server

* Triggering new test server

* Add guard for config setting and add initial tests

* Fix i18n and lint errors

* Triggering new test server

* Add tests for drafts

* fix lint issues

* Add tests for model/draft

* Triggering new test server

* Triggering new test server

* Trigger new test server

* Address PR comments

* Change left join to regular join in GetDraftsForUser

* Fix broken test

Maybe consider adding an inclDeleted field if we want to get deleted drafts in the future

* fix translations

* Add store tests for drafts

* fix test naming

* remove comment

* update migrations

* set feature flag default to false

* update migrations

Co-authored-by: Mylon Suren <mylonsuren@gmail.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

api4/api.go

@@ -139,6 +139,8 @@ type Routes struct {
 	InsightsForUser *mux.Router // 'api/v4/users/me/top'
 
 	Usage *mux.Router // 'api/v4/usage'
+
+	Drafts *mux.Router // 'api/v4/drafts'
 }
 
 type API struct {
@@ -265,6 +267,8 @@ func Init(srv *app.Server) (*API, error) {
 
 	api.BaseRoutes.Usage = api.BaseRoutes.APIRoot.PathPrefix("/usage").Subrouter()
 
+	api.BaseRoutes.Drafts = api.BaseRoutes.APIRoot.PathPrefix("/drafts").Subrouter()
+
 	api.InitUser()
 	api.InitBot()
 	api.InitTeam()
@@ -308,6 +312,7 @@ func Init(srv *app.Server) (*API, error) {
 	api.InitExport()
 	api.InitInsights()
 	api.InitUsage()
+	api.InitDrafts()
 	if err := api.InitGraphQL(); err != nil {
 		return nil, err
 	}