[MM-19948] Set version on module file and internal paths (#13186)

* [MM-19948] Set version on module file and internal paths

* Fixes after merge

* Fix i18n checker error

app/plugin_context.go

@@ -3,7 +3,7 @@
 
 package app
 
-import "github.com/mattermost/mattermost-server/plugin"
+import "github.com/mattermost/mattermost-server/v5/plugin"
 
 func (a *App) PluginContext() *plugin.Context {
 	context := &plugin.Context{