* Add a service for the monitor
* Do not block service start
* gaz
* move channel subscription outide go routine
* add service start test
* fix panic on node tests
* Radek's first pass
* Radek's take 2
* uncap error messages
* revert reversal
* Terence take 1
* gaz
* Missing locks found by Terence
* Track via bool not empty interface
* Add tests for every function
* fix allocation of slice
* Minor cleanups
Co-authored-by: terence tsao <terence@prysmaticlabs.com>