[helm] Adding configurable RunCoordinator (1/n)

Summary: By adding a configurable RunCoordinator to the helm chart, users will able to accomplish run attribution or specify custom hooks when a run is submitted.

Test Plan: Added tests to ensure that new schema elements (i.e. RunCoordinator module/class etc.) render correctly.

Reviewers: rexledesma, johann

Reviewed By: rexledesma

Differential Revision: https://dagster.phacility.com/D8030