Adding python dependencies

[cofinoa]

@miturbide I have added the python dependencies as a conda environment file

I don't know if there is any dependency with specific versions, please review!!

[cofinoa]

This relates to SantanderMetGroup/climate4R#60 and SantanderMetGroup/climate4R/issues/61

[mfansler]

It would be better to instead create a dedicated environment (not r-reticulate) that provides only the software needed by the Python scripts in this package. Since r-reticulate is the default for the reticulate package, it is very much prone to arbitrary changes by the user.

I'd also suggest to more explicitly constrain versions in the YAML file. What matters most is (presumably) correctness and consistency of execution. Ideally, installing say v3.4.0 of this package should always result in mostly the same Python environment. Without versions in the YAML, someone today might end up with Python 3.11, but a year from now with Python 3.13. And it would be unpredictable whether such version-creep will lead to identical evaluation of the Python scripts. I recommend identifying an environment with more definite versions (e.g., major + minor). Whenever a change to those package versions happens, it should involve updating the version of the R package.