Begin work on a data request API (#4045)

[Core] Data Deletion And Disclosure APIs

 - Adds a Data Deletion API
   - Deletion comes in a few forms based on who is requesting
   - Deletion must be handled by 3rd party
 - Adds a Data Collection Disclosure Command
   - Provides a dynamically generated statement from 3rd party
   extensions
 - Modifies the always available commands to be cog compatible
   - Also prevents them from being unloaded accidentally

redbot/core/cog_manager.py

@@ -311,6 +311,10 @@ _ = Translator("CogManagerUI", __file__)
 class CogManagerUI(commands.Cog):
     """Commands to interface with Red's cog manager."""
 
+    async def red_delete_data_for_user(self, **kwargs):
+        """ Nothing to delete (Core Config is handled in a bot method ) """
+        return
+
     @commands.command()
     @checks.is_owner()
     async def paths(self, ctx: commands.Context):