Disambiguate Workers

[jbristowe]

Is your feature request related to a problem? Please describe.
Workers are ONLY differentiated by their associated endpoint (or communication style). This is non-optimal since worker types cannot be identified without inspection of the underlying endpoint.

Describe the solution you'd like
Workers should be classified by their role (i.e. listening tentacle).

Additional context
The following types are to be implemented and based from Worker:

• ListeningTentacleWorker
• PollingTentacleWorker
• SSHConnectionWorker