Add Robust Error Checking to Library and Worker's Communication Patterns

[tphung3]

Proposed Changes

This PR introduces more error checking in the worker when a library first starts up. A worker now sanity-checks a library's name, task_id, and exec_mode instead of just the library's name.

A new library protocol number is also added and should be incremented every time the library changes its communication pattern with the worker.

Issue: #3439.

Merge Checklist

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• make test Run local tests prior to pushing.
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[btovar]

ready to merge?

[tphung3]

Yep. It's RTM.