Add health checking, pass build

[Yshayy]

Fixes #11

Example Scenarios for health checks

1. Error connecting to source for each pipe ->
   1. Pause
   2. Configuration error -> should panic
   3. Connectivity error -> should retry
      1. Eventually should switch to unhealthy
2. Handler check for each pipe
   1. Pause
   2. Connectivity error -> should retry
      1. Eventually should switch to unhealthy
3. Handler % errors in x duration in a pipe
   1. Should pause.
   2. Should try to recover
   3. Eventually should switch to unhealthy