Change api naming

[bitPogo]

What does the PR achieve/Which part improves the PR?

This makes housekeeping in terms of naming. It renames the verifier to collector for Factories. Also moves hard coded things like argument names into constants.

:thinking: DOD Checklist

• [x] My code passes the lint checks.
• [ ] My changes are covered with proper tests.
• [x] All tests are pass.
• [ ] My changes update the documentation.
• [x] My changes are reflected in the changelog.