Add distributed tracing

[raymondjacobson]

Description

What is the purpose of this PR? What is the current behavior? New behavior? Relevant links (e.g. Trello) and/or information pertaining to PR?

Add X-Request-ID header in libs to optionally log out if present on content node & identity service.
I opted to copy the same uuid() generation method we use in the dapp from SO. We currently include a few different versions of the uuid package in libs (inherited from crypto deps) and I don't want to add more bloat there.

Mad dog errors seem to be URSM related

TypeError: Cannot read property 'length' of undefined
    at LibsWrapper.getLibsUserInfo (/home/circleci/project/service-commands/src/libs.js:388:16)
    at process._tickCallback (internal/process/next_tick.js:68:7)
2021-03-23T18:19:44.594Z error: 	Failed test [userReplicaSetManager] with error [Issue with creating and upgrading users: TypeError: Cannot read property 'length' of undefined]
2021-03-23T18:19:44.594Z error: 	Exiting testrunner with errors
2021-03-23T18:19:44.594Z error: 	

Tests

List the manual tests and repro instructions to verify that this PR works as anticipated. Include log analysis if possible.
❗ If this change impacts clients, make sure that you have tested the clients ❗

1. Ran stack locally & tested requests from client with a generated X-Request-ID and ensured the service logged that out
2. Ran stack locally & tested that without the client providing X-Request-ID, the old short-form request id is logged
   ...

❗ Reminder 💡❗:
If this PR touches a critical flow (such as Indexing, Uploads, Gateway or the Filesystem), make sure to add the requires-special-attention label. Add relevant labels as necessary.

[SidSethi]

nice!