Worker status

[jkrumbiegel]

Adds a new workers message for the socket server which sends back metadata about the workers, to be shown via the planned quarto engine julia status command.

Here's one possible way to display that information:

$ quarto engine julia status
Julia server is responding.
  port: 8003
  pid: 48443
  julia version: 1.10.5
  environment: /Users/krumbiegel/.julia/dev/QuartoNotebookRunner
  runner version: 0.11.7
  workers active: 1
    worker 1:
      path: /Users/krumbiegel/dev/quarto-cli/scratch/test.qmd      
      run started: 3:48:01 PM (1 minute 2 seconds ago)    
      run finished: 3:48:11 PM (took 10 seconds)    
      timeout: 1000 seconds (15 minutes 48 seconds left)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.51%. Comparing base (bc028e0) to head (fb568d3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
- Coverage   51.32%   47.51%   -3.81%     
==========================================
  Files          30       28       -2     
  Lines        1286     1269      -17     
==========================================
- Hits          660      603      -57     
- Misses        626      666      +40     

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