feat: add support for go-restful v3

[luqmansen]

#967

[cla-checker-service]

💚 CLA has been signed

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #968 updated

• Start Time: 2021-06-03T09:28:13.132+0000

• Duration: 30 min 16 sec

• Commit: bf6c091

Test stats 🧪

Test	Results
Failed	0
Passed	10739
Skipped	266
Total	11005

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[luqmansen]

Sorry, forgot to sign the contributor agreement, now I have signed it, how to ask the bot to recheck my PR?

edit: done

[axw]

Thanks @luqmansen! Just a couple of minor issues. Please run make fmt update-modules scripts/Dockerfile-testing, then it should be good to merge.

[luqmansen]

Hey, I updated the PR, can you please review it again? Thank you @axw

[axw]

LGTM, thanks! I'll just need to get it to run through CI now.

[axw]

jenkins run the tests please

[axw]

@luqmansen CI looks good except that it fails on older versions of Go that don't support modules. Can you please add a build tag to each file in apmrestfulv3 except for doc.go: // +build go1.11. If you're unfamiliar with using build tags, here's an example for reference:

apm-agent-go/module/apmgopgv10/hook.go

Lines 18 to 20 in 5153274

	// +build go1.14
	package apmgopgv10 // import "go.elastic.co/apm/module/apmgopgv10"

[luqmansen]

Sure, will update this soon

[axw]

🎉 thanks again @luqmansen!

[luqmansen]

Thank you! @axw