ENH: Add new conditions to condition API

[Miksus]

This update also adds new time component: TimeSpanDelta and fixes task crash logging.

[codecov-commenter]

Codecov Report

Merging #57 (a2f001d) into master (91790ee) will increase coverage by 0.14%.
The diff coverage is 96.09%.

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
+ Coverage   90.56%   90.71%   +0.14%     
==========================================
  Files          86       87       +1     
  Lines        3934     4028      +94     
==========================================
+ Hits         3563     3654      +91     
- Misses        371      374       +3     

Impacted Files	Coverage Δ
rocketry/conds/__init__.py	100.00% <ø> (ø)
rocketry/core/task.py	92.61% <91.66%> (+0.51%)	⬆️
rocketry/conditions/api.py	96.69% <95.71%> (-3.31%)	⬇️
rocketry/time/delta.py	97.05% <97.05%> (ø)
rocketry/conditions/task/task.py	91.39% <100.00%> (-0.74%)	⬇️
rocketry/time/__init__.py	100.00% <100.00%> (ø)
rocketry/core/schedule.py	90.00% <0.00%> (+0.03%)	⬆️
rocketry/session.py	91.40% <0.00%> (+0.20%)	⬆️

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