Add EventService CRUD methods

[jeffplays2005]

Added the following:

• Create event
• Get event by ID
• Update event
• Delete event by ID

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit e6d0ec6):

https://uasc-ceebc--pr767-702-backend-create-a-afv7s7ud.web.app

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[jeffplays2005]

Added jsdoc!