feat: Workspace switching redux

[einsteinx2]

Summary

This is an updated implementation of workspace switching. This significantly reduces the amount of time it will take to switch workspaces, since only upload batching is performed before the switch, and any remaining batches are uploaded later.

Testing Plan

• [x] Was this tested locally? If not, explain why.

• Tested extensively using a test app sending events to two different workspaces in addition to unit tests

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

• Closes https://go.mparticle.com/work/SQDSDKS-6593

[mparticle-automation]

:tada: This PR is included in version 8.27.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: