Optional dependency on (geo)pandas

[arthurvd]

Is your feature request related to a problem? Please describe. New utility functions in hydrolib-core may want to use additional 3rd party Python packages such as pandas and geopandas. These functions can now not be placed in hydrolib-core, because we want to keep our required dependencies set as small as possible.

Describe the solution you'd like Poetry and pip support optional dependencies. Try this out in our poetry setup and pip-installable package. More info on: https://python-poetry.org/docs/pyproject/#extras

• check license compatibility
• extend pyproject.toml and other files if necessary
• experiment locally in a poetry developer shell (poetry install --extras "geopandas" / poetry shell)
• build a test pip package and publish it on the TEST environment of pypi
• test that pypi package in a clean environment (pip install hydrolib-core[geopandas])

[veenstrajelmer]

Dependencies in hydromt_delft3dfm and from dfm_tools:

• geopandas
• numpy
• pandas
• xarray
• shapely
• hydrolib-core
• cftime (date2num and num2pydate)