feat: Remove the existing code and added new method 'getUserAudiences'

[Mansi-mParticle]

Instructions

1. PR target branch should be against development
2. PR title name should follow this format: https://github.com/mParticle/mparticle-workflows/blob/main/.github/workflows/pr-title-check.yml
3. PR branch prefix should follow this format: https://github.com/mParticle/mparticle-workflows/blob/main/.github/workflows/pr-branch-check-name.yml

Summary

-Added new method on MParticleUser called getUserAudiences that does a get request from https://nativesdks.mparticle.com/v1/test_key/audience?mpid={mpid}

• remove existing code which is not functional

Testing Plan

• [x] Was this tested locally? If not, explain why.
• Verified through compilation and execution of a local application.

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

• Closes https://go.mparticle.com/work/SQDSDKS-6131