215 only merchants create events

[miramarhaba]

215

This PR fixes the incorrect implementation where any migrant or merchant can create an event. The stakeholder would specifically like events to only be created by merchants.

Depending on what type of user you are, when you try to access events, a different message will show, and the "Create Event" button will only show for merchants.

To test:

• log in with a migrant account

• click on "Events" in the menu

• verify that you see this:

  

• log in with a merchant account

• click on "Events" in the menu

• verify that you see this:

  

• you could optionally also try the same steps with an admin account. the steps should be the same as with a migrant account

[miramarhaba]

Server code should be changed to reflect this too. Only merchant users should be able to call the API endpoints.

@tusmanakhter done