MM-31063: Change constants to use CamelCase (#16608)

* MM-31063: Change constants to use CamelCase

* store package

* change allcaps to camel case (#16615)

* New tools.mod

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

plugin/client.go

@@ -8,8 +8,8 @@ import (
 )
 
 const (
-	INTERNAL_KEY_PREFIX = "mmi_"
-	BOT_USER_KEY        = INTERNAL_KEY_PREFIX + "botid"
+	InternalKeyPrefix = "mmi_"
+	BotUserKey        = InternalKeyPrefix + "botid"
 )
 
 // Starts the serving of a Mattermost plugin over net/rpc. gRPC is not yet supported.