Add a timelimit context handler, eye towards BANE deadlocks

[tjgalvin]

It has been noted that under some strange set of circumstances that BANE can get into a deadlock. There has been some issue raised here for a while (#187 ).

This is a heavy handed attempt to fix it. It establishes a timelimit on the execution of the bane and aegean tasks. Nominally this is set to 45 minutes.

Really this should be fixed where it is an actually problem. Something in BANE, sharedmemory and heavy loads is causing something to go wrong. But for the moment this will do.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 89.65517% with 3 lines in your changes missing coverage. Please review.

Project coverage is 60.53%. Comparing base (6ee17b8) to head (0d985b0).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
flint/prefect/common/imaging.py	25.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #200      +/-   ##
==========================================
+ Coverage   60.48%   60.53%   +0.05%     
==========================================
  Files          35       35              
  Lines        6154     6190      +36     
==========================================
+ Hits         3722     3747      +25     
- Misses       2432     2443      +11     

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