Python 3.12 support / imp module deleted

[EvanBldy]

Bug Report

OpenTimeLineIO plugin for python installs correctly with pip but it cannot import be imported after. It's due to an import of imp module which is deleted and deprecated since python 3.4.

Python 3.12.0 (main, Oct  9 2023, 17:10:54) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import opentimelineio
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/mnt/DATA/DEV/virtualenv/linuxmint/zou3.12/lib/python3.12/site-packages/opentimelineio/__init__.py", line 14, in <module>
    from . import (
  File "/mnt/DATA/DEV/virtualenv/linuxmint/zou3.12/lib/python3.12/site-packages/opentimelineio/schema/__init__.py", line 34, in <module>
    from . schemadef import (
  File "/mnt/DATA/DEV/virtualenv/linuxmint/zou3.12/lib/python3.12/site-packages/opentimelineio/schema/schemadef.py", line 7, in <module>
    from .. import (
  File "/mnt/DATA/DEV/virtualenv/linuxmint/zou3.12/lib/python3.12/site-packages/opentimelineio/plugins/__init__.py", line 8, in <module>
    from .python_plugin import (
  File "/mnt/DATA/DEV/virtualenv/linuxmint/zou3.12/lib/python3.12/site-packages/opentimelineio/plugins/python_plugin.py", line 7, in <module>
    import imp
ModuleNotFoundError: No module named 'imp'

I will make a PR to fix that.

To Reproduce

1. Operating System : Linux Mint
2. Python version : 3.12

Expected Behavior

To work on python 3.12.

[EvanBldy]

I close because my PR is validated :)