New packaging

[leolivier]

Modernized packaging using only build and github action

[leolivier]

Hi, this PR fixes the incompatibility with Django 5.1 + allows verification of emails for existing inactive users without forms (inspired by previous PRs which contained bugs) and modernized the packaging.
There are a lot of files changed just because for the modernization of pacjackging, I had to move the verify_email folder inside a src folder. The number of really changed files is very low (4 I think)
The github workflow is also modified in order to publish the package on test.pypi.org instead of pypi on a simple push, while creating a release will deploy it on pypi.
Also, the connection to github is modernized using a token, so you have to create a token in github and store it in the project secrets

IMPORTANT! On this modernization topic, to check it worked and as I had no right to publish a new version on PyPi for the project, I had to change the project name in pyproject.toml and use django-email-validation instead of Django-Verify-Email (and you can test this package django-email-validation with version 2.0.4 to check it works).
So if this PR is accepted, the name must be changed back to the initial value before delivering...

[foo290]

Yoooo! thanks for all the changes and suggestions man! Lemme review these