make raster layer backward compatible

[wang-boyu]

This is an attempt trying to make #299 less breaking.

Previously in our gis examples, we demonstrated how to subclass Cell:

class LakeCell(mesa_geo.Cell):
    def __init__(self, model, pos=None, indices=None):
        super().__init__(model, pos, indices)
        ...

But this will result in an error TypeError: LakeCell.__init__() got an unexpected keyword argument 'rowcol' with the changes in #299.

Therefore in mesa/mesa-examples#320 we update our gis example to update Cell subclass to:

class LakeCell(mesa_geo.Cell):
    def __init__(self, model=None, **kwargs):
        super().__init__(model, **kwargs)
        ...

To make it less breaking, in this PR we update the _initialize_cells method in RasterLayer so that it works with both the old and the new ways of subclassing Cell.

In addition, we also removed the deprecation warning for cell.pos since it inherits Mesa.Agent and its pos is set to None by default, trigging the warning (see mesa/mesa-examples#320 (comment)).

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[codecov]

Codecov Report

❌ Patch coverage is 69.56522% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.67%. Comparing base (b19c8ba) to head (d08077f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
mesa_geo/raster_layers.py	69.56%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
- Coverage   78.08%   77.67%   -0.42%     
==========================================
  Files          10       10              
  Lines         940      954      +14     
  Branches      144      146       +2     
==========================================
+ Hits          734      741       +7     
- Misses        169      174       +5     
- Partials       37       39       +2     

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[EwoutH]

Didn't review line by line, but sounds good!

[wang-boyu]

Thanks @EwoutH ! Merging now.