Remove pandas, geopandas, shapely as required dependencies

[kylebarron]

Closes https://github.com/developmentseed/lonboard/issues/236

Todo:

• [ ] Ensure user is on pandas >=2 https://github.com/developmentseed/lonboard/issues/236#issue-1988103344
• [ ] Add test environment on CI without pandas, shapely, geopandas
• [ ] Skip relevant pytest tests when pandas, shapely, geopandas are not installed