Alternative package: MapMaths.jl

[visr]

I just became aware of https://github.com/subnero1/MapMaths.jl, which is a possible alternative to this package.
It was announced in this Discourse thread by @ettersi.

Here is a discussion on some differences:
https://github.com/subnero1/MapMaths.jl?tab=readme-ov-file#mapmaths-vs-geodesy

We should probably link to MapMaths.jl in the Geodesy.jl readme as well.

@ettersi you mention Geodesy has a much larger number of contributors. That may be true over time, but currently it is not really being actively developed. I agree it would be great to move towards one standard package that is properly maintained. In my opinion breaking changes to Geodesy.jl are also an option to reach that goal.