[Chore] Restructure project layout to conform to community convention

[treyburn]

/internal/pkg is the norm - so I should use it here too as appropriate.

Also I brought in the goimports formatter to clean up import ordering.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 14.67%. Comparing base (eedccec) to head (8ce0b1c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #16   +/-   ##
=======================================
  Coverage   14.67%   14.67%           
=======================================
  Files           5        5           
  Lines         334      334           
=======================================
  Hits           49       49           
  Misses        283      283           
  Partials        2        2           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.