remote: add support for pystuck

[jluebbe]

To allow debugging in production, we need a way to introspect objects in the coordinator and exporter without stopping the process. This is possible with pystuck.

We add it as a dev dependency only, as it's only needed in special circumstances and can be installed manually in that case. It is only enabled when the --pystuck option is passed on startup.

[codecov]

Codecov Report

Attention: Patch coverage is 22.72727% with 17 lines in your changes missing coverage. Please review.

Project coverage is 56.1%. Comparing base (fff35ee) to head (289599d).
Report is 4 commits behind head on master.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
labgrid/remote/coordinator.py	0.0%	11 Missing ⚠️
labgrid/remote/exporter.py	45.4%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1572     +/-   ##
========================================
- Coverage    56.2%   56.1%   -0.1%     
========================================
  Files         170     170             
  Lines       13248   13270     +22     
========================================
+ Hits         7449    7454      +5     
- Misses       5799    5816     +17     

Flag	Coverage Δ
3.10	56.1% <22.7%> (-0.1%)	⬇️
3.11	56.1% <22.7%> (-0.1%)	⬇️
3.12	56.1% <22.7%> (-0.1%)	⬇️
3.13	56.1% <22.7%> (-0.1%)	⬇️
3.9	56.2% <22.7%> (-0.1%)	⬇️

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