[Bugfix] Fix python bindings for OBB

[Skylion007]

Motivation and Context

• The constructor for OBB now takes a Magnum Quaternion. We don't have any casters from numpy-quaternion to Eigen::Quaternion. Therefore, the previous constructor could never be called. Now the user can pass a Magnum::Quaternion instead which we will cast to an Eigen equivalent.

How Has This Been Tested

• Locally

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have completed my CLA (see CONTRIBUTING)
• I have added tests to cover my changes.
• All new and existing tests passed.