Make a schema for meta data

[vientang]

We're getting a lot of data from meetup api. Let's save the ones that can help us.

• Date of last game recorded. Helpful when fetching game data from meetup api to not over fetch (aka don't fetch for games that have been recorded)
• Waitlist count. Might be helpful to visualize trends (during what time of the year do we get more interests)
• Group's created date. Maybe useful to show how the group has grown over the years?
• Anything else that might be useful

[vientang]

69 will save meta data in existing PlayerStats and GameStats table