Add support for service.name

[basepi]

As of 5.10.1, elastic-apm provides service.name as one of the log correlation fields. This PR supports that new addition.

[beniwohli]

LGTM!

[ghost]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Build Cause: Pull request #32 opened

• • Start Time: 2021-01-21T16:02:15.143+0000

• Duration: 8 min 36 sec

• Commit: bab94b9

Test stats 🧪

Test	Results
Failed	0
Passed	233
Skipped	8
Total	241