Get userid from the session for create expenses

[saifahn]

Overview

• [ ] Get user id from session
• [ ] Create expense with that user id

[saifahn]

2021-12-13

Tasks:

• [ ] In webservice.go:CreateExpense, remove the userID from FormValue check, and instead get the userID from the session.
  • [ ] We can actually combine sessions.GetUserID with sessions.Validate as they essentially do the same thing
  • [ ] Then use VerifyUser to pass the userID as context to the CreateExpense
  • https://stackoverflow.com/questions/39946583/how-to-pass-context-in-golang-request-to-middleware
• [ ] Remove the userID part of the create expense form