[CLI] Install instructions message for OpenEye when module is not found

[ijpulidos]

When using the CLI it can be helpful for users to get instructions on how to install openeye module when it's not found.

The idea would be to try to catch the exception and output an error message with instruction on how to install openeye.

This would only affect CLI usage, we expect users of the Python API to know how to handle this issue.

[ijpulidos]

One difficulty here is that we have different CLIs for the different subpackages, we need to figure out if there's a centralized file that's importing openeye for all of them or if we need to change all of them separately.