Decide which icon libraries we use and replace current icons

[mbeckem]

We are currently using the react-icons package directly.
This can be problematic for projects because they cannot easily determine which licenses apply (because we could have used any of the available icon sets).

Idea:

• Create a common icons package (e.g. "map-icons"). This package should then be used by all other packages.
• use / re-export icons from selected icon sets
• document their licenses
• (maybe include font-gis package)

Also interesting: https://lucide.dev/