[MEWM] Restrict MEWM Access to Sponsors with Events

[andrewdimmer]

Describe the bug
Currently, any sponsor is able to preform actions on the Mini Events and Workshops Module provided that the companyId of the event matches the companyId of the SPONSOR user who creates that event. Then, all of the approval process for the event is done by the organizer team, who will need to manually reject any events created by sponsors that don't have events as a sponsor benefit.

Expected behavior
Not all sponsors have events, so the MEWM should be restricted to only include sponsors that have events based on the benefits listed for them in the STPM (as exposed by #25 ). This will also likely require a breaking change to the STMP data type to standardize how the Event Types and STPM benefits connect.

Additional context
Additional thought will be required to figure out the edge case where the sponsor event benefits change after events have been created though, however, which is the reason this issue has been moved to unallocated.