RFE: Add ability to specify python version for venv during ade install

[adworjan]

Add the ability to specify the exact version of python to be installed within a venv rather than using the system default. This reduces the need to either manually create a venv if a specific version is needed or eliminates the need to set update-alternatives for python.

This would be best as a flag to add into ade install

[ssbarnea]

In fact we are using the same python interpreter used to install ade, but I do agree that this would be a good addition.

A contribution would be welcomed here, it should implement:

-p, --python <PYTHON>

This should follow uv venv implementation:

• a fully qualified path to a python executable
• an executable (first found in PATH to be used)
• a value such 3.10 and in this case python{} will be searched in PATH

This means that when uv is present we just need to pass through the argument, but when python own venv is present, we need to implement the logic above.