ENH: Add SchedulerLogger

[Miksus]

SchedulerLogger is to TaskLogger:

from rocketry.args import TaskLogger, SchedulerLogger
@app.setup()
def setup_app(task_logger=TaskLogger(), sched_logger=SchedulerLogger()):
    sched_logger.addHandler(...)

[codecov-commenter]

Codecov Report

Base: 95.36% // Head: 95.36% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (d5607a4) compared to base (8384fab).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #156   +/-   ##
=======================================
  Coverage   95.36%   95.36%           
=======================================
  Files          80       80           
  Lines        4656     4660    +4     
=======================================
+ Hits         4440     4444    +4     
  Misses        216      216           

Impacted Files	Coverage Δ
rocketry/args/builtin.py	98.22% <100.00%> (+0.04%)	⬆️

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