New programming model

[andystaples]

Issue describing the changes in this PR

Adds support for worker indexing to the functions worker

Pull request checklist

• [ ] My changes do not require documentation changes
  • [ ] Otherwise: Documentation issue linked to PR
• [ ] My changes should not be added to the release notes for the next release
  • [ ] Otherwise: I've added my notes to release_notes.md
• [x] My changes do not need to be backported to a previous version
  • [ ] Otherwise: Backport tracked by issue/PR #issue_or_pr
• [ ] I have added all required tests (Unit tests, E2E tests)

[andystaples]

@Francisco-Gamino I think this PR is correct. The rebase was awful and doubled the amount of commits, not sure why. Lots still to do here, gotta bundle the module with the worker and figure out how to get the cmdlet available in order to write tests for the new programming model