Ipc between agent and task

[tevoinea]

Summary of the Pull Request

What is this about?

This is a re-attempt of #2910 which adds a 2 way IPC connection between the agent and the task, and also implements a graceful shutdown on top of that connection.

What is different this time is that the graceful shutdown is implicitly tied to the lifetime of the IPC connection. In other words, when the IPC connection drops and the task sees the disconnect, the task will gracefully shut down.

[codecov-commenter]

Codecov Report

Merging #2912 (39c9568) into main (a374939) will decrease coverage by 0.46%.
The diff coverage is 43.92%.

@@            Coverage Diff             @@
##             main    #2912      +/-   ##
==========================================
- Coverage   29.38%   28.93%   -0.46%     
==========================================
  Files         271      303      +32     
  Lines       30281    36131    +5850     
==========================================
+ Hits         8899    10455    +1556     
- Misses      21382    25676    +4294     

Impacted Files	Coverage Δ
src/agent/onefuzz-agent/src/scheduler.rs	51.97% <0.00%> (-1.83%)	⬇️
src/agent/onefuzz-task/src/local/common.rs	0.00% <0.00%> (ø)
src/agent/onefuzz-task/src/managed/cmd.rs	0.00% <0.00%> (ø)
src/agent/onefuzz-task/src/tasks/config.rs	0.00% <ø> (ø)
src/agent/onefuzz-task/src/tasks/fuzz/generator.rs	0.00% <0.00%> (ø)
...rc/agent/onefuzz-task/src/tasks/fuzz/supervisor.rs	0.00% <0.00%> (ø)
src/agent/onefuzz/src/ipc.rs	0.00% <0.00%> (ø)
src/agent/onefuzz/src/lib.rs	100.00% <ø> (ø)
src/agent/onefuzz-agent/src/worker.rs	47.70% <30.39%> (-11.39%)	⬇️
src/agent/onefuzz-agent/src/worker/double.rs	86.36% <70.00%> (-13.64%)	⬇️
... and 1 more

... and 49 files with indirect coverage changes

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[mgreisen]