- Minor linting improvement

- Improved subscriber error handling and logging

- Added wait conditions to ensure Context connects to NATS.

- Skip NATS client port from linkerd
- Add NATS backend logging messages

- Added/Updated headers
- Added script to update copyright headers

- disabled event testing; operation works, but sometimes tests get stuck
- added dynamic wait for CockroachDB and NATS containers to start
- tuned grace shutdown period
- improved NatsBackend termination

- Added backend for NATS message broker
- removed unneeded test script