Use config table to customize the memory retrieval parameters for Tachio

[rajivsinclair]

If we want Tachio to retrieve 15 memories of each type instead of just 5 memories of each type, then it should be possible to make this adjustment without impacting other instances of Coach Artie. One solution for this could be to fetch the min/max number of memories of each type to retrieve from the database so that it can be adjusted by editing the config table on supabase, like the custom prompts.