feat: add capture.py - also fixes audio recording

[0dm]

What kind of change does this PR introduce?
Adds a new module - capture for macOS. This allows for easy screen + audio recording.

    capture = OpenAdaptCapture()
    capture.start(audio=True)
    input("Press enter to stop")
    capture.stop()

bugfix: we can now record audio while also recording window states.

Summary

motivation: i dug through apple's api for what felt like ages
creating this allowed me to easily debug and find the cause of the error getting focused window bug - closes #183
this is also useful if we ever need a recording.

Checklist

• My code follows the style guidelines of OpenAdapt
• I have performed a self-review of my code
• If applicable, I have added tests to prove my fix is functional/effective
• I have linted my code locally prior to submission
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (e.g. README.md, requirements.txt)
• New and existing unit tests pass locally with my changes

How can your code be run and tested?

demo: https://streamable.com/5a09ym
captured via capture.py
you can clearly hear the audio!

Other information

[abrichr]

Than you @0dm! Any thoughts on how to implement this on Windows? Do you have a Windows machine you can use?

[0dm]

@abrichr I can try working on a Windows version (win32) using Parallels.

[abrichr]

LGTM! 🚀