Provide D10 support for the 8.x-1 branch

I see it working now:

There's some CSPELL / PHPCS that I'll fix now.

Fixed the pipeline jobs and it's green now: https://git.drupalcode.org/project/timepicker/-/merge_requests/32

Feel free anyone to review this (for extra credits!)

I'll merge this to the 8.x-1.x branch and create a new release.