CLI: Store OAuth credentials in local file

[rikroe]

Breaking change

Every CLI command now stores the API credentials in a file for reuse in later calls. By default, data is stored to ~/.bimmer_connected.json (Mac and Linux) or C:\Users\username\.bimmer_connected.json (Windows). The file location can be changed using the --oauth-store parameter.
If you don't want the data stored, use the --disable-oauth-store parameter.

Proposed change

Store OAuth2 tokens from API for commandline calls so everybody not using Home Assistant does not have to go through a full reauthentication flow on every CLI command.

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 #
• This PR is related to issue:

Checklist

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

[gerard33]

👍🏻