fix: add currentTraceIds to typings

[hmdhk]

This PR adds agent.currentTraceIds to typings.

Fixes #1630

Checklist

• Implement code
• Add tests
• Update TypeScript typings
• Update documentation
• Commit message follows commit guidelines

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Branch indexing]

• Start Time: 2020-05-19T18:21:02.407+0000

• Duration: 18 min 28 sec (1107577)

Test stats 🧪

Test	Results
Failed	0
Passed	179244
Skipped	0
Total	179244

[vigneshshanmugam]

@hamid Can you also add the currentTraceIds to types test? makes it easy to catch errors.

https://github.com/elastic/apm-agent-nodejs/blob/master/test/types/index.ts

[watson]

This PR seems to contain more than what it's supposed to... e.g. the changes to nodejs.memory.arrayBuffers.bytes etc should not be part of this right?

[hmdhk]

@watson , that's correct, the first commit on the PR is not mine. There seems to have been a force-push to master which probably caused this problem.

I will rebase on the new master

[watson]

Ah yes, that force push was me. There was a problem with a commit that was merged into master so I had to force push it to fix tests - sorry about that 😓

[watson]

Looks great! Just a tiny nit

[watson]

The Windows error you see on Jenkins is unrelated and is fixed in master. It's just an issue with Docker on Jenkins. I'll merge in master just to see that everything passes.

[paulrostorp]

Any visibility on when this will be released ?