Add grid intersection code

[maxmargraf]

This PR should add the calculation of the weights of the grid intersections between line and grid from pycomlink to close #5.

• [x] closes #5
• [x] Tests added and passed if fixing a bug or adding a new feature
• [x] All code checks from pre-commit passed
• [x] Added an entry in the CHANGELOG.md file

[maxmargraf]

To overcome the issue of descending lon/lat coordinates there should be a check based on this raise that checks if lon or lat are descending and if true, a flip along the respective axes e.g. like here.

[maxmargraf]

• We should raise an error in calc_intersect() if lat or lon coords are not ascending (like its correctly raised right know in _calc_grid_corners_for_lower_left_location(). The error should add a code snippet how to flip on or lat OR we add an option to automatically flip the coords to be ascending ~BUT we happens if we have a grid over the equator and on the southern hemisphere? --> what do we do with a global grid with lower left definition of the grid??~ --> all (sub-)global grids should work because they are typically ascending from bottom left to top right

• Additionally, the offset for the bounding box should be calculated in the center of the grid and should be always positive

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (61c4063) to head (9bd47f3). Report is 10 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #19 +/- ## ========================================== Coverage 100.00% 100.00% ========================================== Files 3 4 +1 Lines 43 205 +162 ========================================== + Hits 43 205 +162 ```

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[maxmargraf]

Summary of recent changes:

• mainly updating the style of the grid intersection and test code
• updating the projects .toml file
• removing pixel_poly_list
• adding some additional tests for full coverage

Open to suggestions but ready to be merged from my side-

[cchwala]

🎉 Thanks @maxmargraf