adding new ext-connector entity type

[npreiser]

This is a new ent type for testing potential future use.

Relevant information

Checklist

• [x] I've read the guidelines and understand the acceptance criteria.
• [x] The value of the attribute marked as identifier will be unique and valid.
• [x] I've confirmed that my entity type wasn't already defined. If it is I'm providing an explanation above.

[CLAassistant]

All committers have signed the CLA.

[npreiser]

I think I need to redo my identifier,,

[npreiser]

I am not clear on if there is still a error on this PR or not?, Can someone help .

[npreiser]

changed to compositeIdentifer and updated the summary metrics, let me know if anything else is needed. thanks

[npreiser]

I changed the expiration

[npreiser]

I think I addressed everything, please let me know if there is anything else.

[naxhh]

@lujop you added the label waiting on submitter feedback but I don't see any open topic

Something i should be aware of?

[andre-nr]

Closing it for now, feel free to re-open