Add process status to tasks

[noahmehl]

Overview

As a user, it would be convenient to see the process_status value for a compaction job. This is because smoosh may start a compaction job and have some progress before suspending it because it's outside the window for processing.

Testing recommendations

GitHub issue number

This is to address this issue: apache/couchdb#3816

Related Pull Requests

N/A

Checklist

• Code is written and works correctly;
• Changes are covered by tests;
• Documentation reflects the changes;
• Update rebar.config.script with the correct tag once a new Fauxton release is made

[espy]

Hello and thanks for your contribution! @janl and I tested this change with view and db compactions, replications and indexing, and I observed it appearing with compactions and indexing. The effect is that it occasionally appends progress status: running or progress status: runnable to the end of the status table cells. Most of the time, no message is visible, presumably because it’s waiting and the code omits that. I could not observe any other status types. Some screenshots for reference:

👍 from us!

[Antonio-Maranhao]

Thanks @noahmehl for the PR, and Jan and Alex for testing it out. Tests passed so I'm merging it.