refactor: rename `examples/native` as

[mdjastrzebski]

Describe the improvement
Currently the examples/native has a special status when it doubles as our test app that is generating the reports for the PR submitted to this Reassure repo and as example for RN implementation as well. That is not ideal as the example app contains some Reassure monorepo specific code.

Suggested implementation steps
Move examples/native to test-apps/native. Update all necessary paths to make it work, etc. No other code changes should be made. That PR will be large but easy to review.

This is based on following plan for splitting these two roles: #372 (comment)