ENH: Option to silence log errors

[Miksus]

This PR has the following changes:

• add: silence_task_logging config option (log failures won't crash scheduler if true)
• More robust shut down (hooks are always run)
• Better scheduler log messages/levels

[codecov-commenter]

Codecov Report

Merging #83 (9aba2da) into master (7584cb1) will increase coverage by 0.25%. The diff coverage is 96.96%.

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
+ Coverage   91.14%   91.39%   +0.25%     
==========================================
  Files          88       89       +1     
  Lines        4368     4474     +106     
==========================================
+ Hits         3981     4089     +108     
+ Misses        387      385       -2     

Impacted Files	Coverage Δ
rocketry/core/schedule.py	91.66% <95.45%> (+2.01%)	:arrow_up:
rocketry/core/task.py	93.30% <96.87%> (+0.29%)	:arrow_up:
rocketry/exc.py	100.00% <100.00%> (ø)
rocketry/session.py	91.97% <100.00%> (+0.02%)	:arrow_up:
rocketry/testing/log.py	100.00% <100.00%> (ø)

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