[V3 Config] Record custom group information using cog_add event (#2550)

* Do things differently

* Uncomment critical lines

* Reduce, reuse, recycle

* Check groups on all new config objects after a cog loads

* I don't know why this is failing now or why we need the global keyword

* gotta fix this too

redbot/core/events.py

@@ -15,6 +15,7 @@ from pkg_resources import DistributionNotFound
 
 from .. import __version__ as red_version, version_info as red_version_info, VersionInfo
 from . import commands
+from .config import get_latest_confs
 from .data_manager import storage_type
 from .utils.chat_formatting import inline, bordered, format_perms_list, humanize_timedelta
 from .utils import fuzzy_command_search, format_fuzzy_results
@@ -305,6 +306,14 @@ def init_events(bot, cli_flags):
             if command_obj is not None:
                 command_obj.enable_in(guild)
 
+    @bot.event
+    async def on_cog_add(cog: commands.Cog):
+        confs = get_latest_confs()
+        for c in confs:
+            uuid = c.unique_identifier
+            group_data = c.custom_groups
+            await bot.db.custom("CUSTOM_GROUPS", c.cog_name, uuid).set(group_data)
+
 
 def _get_startup_screen_specs():
     """Get specs for displaying the startup screen on stdout.