[teslascope] Support basic FSD Stats

[psmedley]

Add basic support for some FSD stats:

• distance travelled on FSD
• distance travelled total
• % of travel on FSD

[wborn]

This PR is being reviewed with AI first.

The new FSD values are wired through the API model and handler, and the version-3 migration for existing Things is present.

One functional issue needs to be addressed before merge: the new channel types are not referenced from the vehicle Thing type, so newly created vehicle Things would not contain these channels.

Please also update the binding README and regenerate the default i18n properties for the new channel metadata.

[wborn]

The findings from the previous review have been addressed. One small documentation regression remains in the README; otherwise no further issues were found in the current changes.

This review was AI-assisted.

Minor issue remaining

[lsiepel]

Thanks, LGTM