Remove `mesa.space` dependency from `mesa-geo`

[falloficarus22]

Describe the bug
mesa-geo currently imports symbols from mesa.space, which is removed in mesa/mesa#3337

Expected behavior
mesa-geo should import successfully on current Mesa and use supported APIs (mesa.discrete_space / mesa.experimental.continuous_space where relevant), without depending on mesa.space.

To Reproduce

1. Use latest Mesa (3.5.0.dev0)
2. In mesa-geo run:

python -c "import mesa_geo"

3. Observe failure:

ModuleNotFoundError: No module named 'mesa.space'

Direct failing import location:
raster_layers.py (line 19) (from mesa.space import Coordinate, accept_tuple_argument)

Additional context

• This is a hard import-time break, not a deprecation warning.
• A full migration should remove all mesa.space imports/usages from mesa-geo and replace type aliases/decorators with equivalents that do not require legacy Mesa space internals.