Add callback for BANE singularity stream handler

[tjgalvin]

Its been noted that sometimes BANE gets into a weird deadlock type error. I suspect it is some strange conspiracy that could be eliminated with changes to BANE and its uses of shared memory and load on the system. I can not reliably reproduce it.

This pull request attempts to detect the deadlock mode, and raise an error, which is subsequently prompts flint to rerun the singularity command.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 62.50000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 60.56%. Comparing base (427088e) to head (d073286).

Files with missing lines	Patch %	Lines
flint/sclient.py	14.28%	6 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #204   +/-   ##
=======================================
  Coverage   60.56%   60.56%           
=======================================
  Files          35       35           
  Lines        6187     6203   +16     
=======================================
+ Hits         3747     3757   +10     
- Misses       2440     2446    +6     

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