Gh 10166 (#13021)

* model/config: add required server config field to manifest

* plugin/helpers: add check required server configuration method

* plugin/helpers: code polish

* model/manifest: add documentation

* Update plugin/helpers_config.go

Co-Authored-By: Ben Schumacher <ben.schumacher@mattermost.com>

* plugin/helpers_config: remove stagnant line

* plugin/helpers: update to v5

* plugin/helpers_config: add license

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>
Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>
Co-authored-by: mattermod <mattermod@users.noreply.github.com>

plugin/helpers.go

@@ -58,6 +58,12 @@ type Helpers interface {
 	// Minimum server version: 5.6
 	KVSetWithExpiryJSON(key string, value interface{}, expireInSeconds int64) error
 
+	// CheckRequiredServerConfiguration checks if the server is configured according to
+	// plugin requirements.
+	//
+	// Minimum server version: 5.2
+	CheckRequiredServerConfiguration(req *model.Config) (bool, error)
+
 	// ShouldProcessMessage returns if the message should be processed by a message hook.
 	//
 	// Use this method to avoid processing unnecessary messages in a MessageHasBeenPosted