Added account management features

[JunHammy]

What was done in this PR

1. Added updateAccountDetails
2. Added deleteAccount
3. Added changePassword

New features description

1. All changing and updating of account data includes thorough validations
2. Updating of account details checks if the inputs are unique and in the correct format
3. Delete account removes the entire row of data from the database
4. Change password checks if the current password input matches the password of the user

[Prakhar896]

Generally well-written; please remember that for caught exceptions in a try-catch are meant to be Logger.loged with the error message of the caught exception. In all other scenarios, there should just be a ERROR or UERROR response to the client, no console.logs.

[Prakhar896]

Please try to keep in mind the whole project when coding; high cognitive and logical reasoning is a requirement to write good, reliable and secure code.

[Prakhar896]

If validation fails, yup will throw an array of errors (because you configured it to not abortEarly) which will be caught by your catch block. But, your catch block is considering it to be an internal server error, which is misleading. Must be changed in the next PR. @JunHammy

[Prakhar896]

LGTM