Handle captcha in North America

[rikroe]

Breaking change

BMW API for North America now requires a captcha to be solved. The token needs to be used during first init of MyBMWAccount(..., hcaptcha_token=TOKEN) or with the --captcha-token CLI parameter. See the documentation for more information.
This does only apply when using the library outside Home Assistant.

Proposed change

Fix the login. Only required when not using the refresh_token flow.
Unfortunatly, this requires a manual intervention on the first login (or after any failed login attempt).

Once merged to master and a build is on readthedocs, I'll double check if the links are working as expected.

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to this library)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Client Authentication Failed #661
• This PR is related to issue: BMW North America unable to login home-assistant/core#128598

Checklist

• The code change is tested and works locally.
• Tests have been added to verify that the new code works.

[gerard33]

Great work 👍🏻

[johnwalk61]

Awesome work!