REST API ConnectorIds overview call

How: Add a REST API call which returns a list of all the connectorIds and the count of connectorstates

Why: Retrieve all the connectorstates with /api/v1.0.0/extensions/connectorstates can be quite overwhelming, and unneeded.

Example Result:

For Who: Every customer using connectorstates

Impact: Low

Additional context:

Handy including "INSE-I-415 ConnectorStates paging / maximum".