refactor: Add Type interfaces for identity api client

[alexs-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

• Create Type Interfaces for Identity API Client

Testing Plan

• Was this tested locally? If not, explain why.
• N/A - Defines new type interfaces but they will not be used until we refactor api client

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

• Closes https://go.mparticle.com/work/SQDSDKS-6678

[rmi22186]

generally lgtm, but see my comment about PR-ing into a feature branch so that the unused interface is appropriately used and shown to be working. not a hill i'd die on (especially for less complicated interfaces such as https://github.com/mParticle/mparticle-web-sdk/pull/946/files), and i'm open to just merging it straight in. but figured good to discuss.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud