Add pybind11 wrappings for Imath::Frustum

[nmishra-ufl]

Fix for issue #428

Created a pybind11 wrapping file based on the specified template. Requires further testing, as this is my first time using pybind11.

[linux-foundation-easycla[bot]]

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[cary-ilm]

@nmishra-ufl, we'd like to accept this contribution, but would prefer to see the changes noted above, adding the other pieces that hook the code into the existing framework. Would you be able to address those soon? Thanks!

[cary-ilm]

@nmishra-ufl, following up on this again, will you be able to complete the implementation? I can help if you have any questions about what to do. Thanks!

[bareya]

Hi @cary-ilm I reworked those bindings in #464, this request can be closed. We can move conversation there.