Send domain name when detected

[stevejgordon]

Fixes #2065.

A reference implementation for elastic/apm#795.

[apmmachine]

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• Start Time: 2023-05-11T06:52:53.903+0000

• Duration: 74 min 34 sec

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Test	Results
Failed	0
Passed	2536
Skipped	33
Total	2569

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[stevejgordon]

I think this is ready for review depending on any changes needed as an outcome of this discussion.

[Mpdreamz]

LGTM but not sure why Elastic.Apm.MongoDb got changed?