feat/update-user-data-endpoint

[floscodes]

This PR provides an endpoint to update the data of a logged in user

Update current user

To update user data in the database, send name, email and password to update in the /update endpoint.
It will also be checked if the new username and email already exist. If so, an error will be returned.

Example Curl request:

curl --location '127.0.0.1:5150/api/auth/update' \
     --header 'Content-Type: application/json' \
     --header 'Authorization: Bearer TOKEN'
     --data '{
         "name": "new-name",
         "email": "new-email@loco.rs",
         "password": "new-password"
     }'

[floscodes]

Hi @kaplanelad, after a few errors occurred, I’ve made some fixes in this PR. Could you please trigger the CI tests again? Thank you! 🙏

[kaplanelad]

Hey,
This PR includes many changes that don’t seem related to its purpose.
Please make sure that only the relevant changes are included in the PR.

[floscodes]

Hi @kaplanelad ,
I’ve implemented the update-user-data endpoint and reverted the formatting changes. Should be ready for review — does this look okay now?