Support login using email and password

[Fkawala]

It could be implemented in the Client class using something like :

def get_label_studio_token(host: str, email: str, password: str):
    url = f'http://{host}/user/login'
    client = requests.session()
    # Retrieve and set the CSRF token first
    client.get(url)
    # Django 1.6 and up use csrftoken wheras previous version use csrf
    csrf_token = client.cookies.get('csrftoken', None)
    login_data = dict(email=email, password=password, csrfmiddlewaretoken=csrf_token)
    client.post(url, data=login_data, headers=dict(Referer=url)).raise_for_status()
    token = client.get(f"http://{host}/api/current-user/token").json().get("token")
    return token

I might do a PR if you think this is a desirable feature.

[makseq]

@Fkawala Sure, PR would be great! Thanks!