feat: Add Audience Support Reverts(#171)"

[BrandonStalnaker]

Summary

• This reverts commit 1c04262 and exposes a method to allow our users to request what audiences a user is part of.

Testing Plan

• Tested using QA endpoints

Reference Issue (For mParticle employees only. Ignore if you are an outside contributor)

• Closes https://go.mparticle.com/work/SQDSDKS-5993

[einsteinx2]

Thanks for merging this into a feature branch. This looks good for now. As discussed the implementation will be changing once the backend work is done.