Fix and improve validate_params

[ulupo]

Reference issues/PRs Motivated by discussion in #479.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description I found that validate_params did not work as intended when allowed types are in a tuple. The 'of' key was ignored in that case. So e.g. in

hyperparameters = {"parameter": {"type": (type(None), np.ndarray), "of": {"type": np.float}}}

the type of each entry in the case of ndarray was not actually being checked to be an instance of np.float. Furthermore, a simple fix allows to address the case relevant to #479 of tuples of types including list-like and numeric types. Previously, it would not be possible to have both an 'in' and an 'of' key. Now it is, and 'in' is only used for non-list-like types, and 'of' otherwise.

Checklist

• [x] I have read the guidelines for contributing.
• [x] My code follows the code style of this project. I used flake8 to check my Python changes.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed. I used pytest to check this on Python tests.