story(storage): support mongodb for reading events

[Zaba505]

Description

As a end-user, I want to be able to record and retrieve my events from MongoDB.

Acceptance Criteria

• Should be able to get a single event by event id
• Should be able to retrieve up until a timestamp
• Should return a slice of events, an any cursor, and finally an error

Related Issues

No response

[erictg]

I was thinking more about this, should it really be a cursor or some pagination method? @Zaba505

With mongo the cursor should just be contained into the query. I know other dbs can handle this differently.