TimeSheet Endpoint: POST and GET Requests Working Functionality

The /timesheet endpoint exists, but does not currently have any data flow with it.

Implement the functionality inside /auth/timesheet with the following design:

GET: A Get request returns the timesheets for a given user

POST: Body: {timesheet: TimeSheetSchema} Will allow a specific timesheet to be uploaded to the DB

Terms of Acceptance:

Get Request will return the timesheets for a given user
Post will allow a timesheet to be uploaded
Post should have input validation before uploading (use zod and TimeSheetSchema)
Entry is mutated if it already exists
UserID functionality exists to grab the userid from the JWT token

Code-4-Community / breaktime-backend