Add support for Dark Mode

[jeffpaul]

Is your enhancement related to a problem? Please describe.

According to a WP.org review post, MapKit JS supports Dark Mode. Assuming that's correct, adding that feature would be a nice addition. If there's some way to inherit from the theme styles that a "dark mode" is enabled and automatically change that in the block that would be great (hopefully @fabiankaegy can help highlight how we might achieve that). Alternatively a toggle in the block for Dark Mode would suffice.

Designs

n/a

Describe alternatives you've considered

n/a

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

[RuhaniMakhija]

Hello I would like to work on this issue