Adds onCallGenkit (#1655)

* Checkpoint. Wrote code. need to write tests. Going to mess around with typing

* Tests

* TSConfig changes

* Revert "TSConfig changes"

This reverts commit b460ad1.

* Checkpoint. Time to ask for help

* Working model with loose dependencies

* Add note for future test

* Format

* Fix test

* Fix detection of no secrets

* Add type correctness check

* Format

* Update test now that SSE is delimited by two newlines

* Remove unnecessary line

* Remove a TODO that has been done

* Figured out how to remove tslint errors

Author: inlined