added optional params cp_path and logfile_name to the setup_logger fu…

[MaxJoas]

As of my understanding, the only way to get information about the loss, is in the ~/.cellpose/run.log file.
For me (and probably for others too) I often start multiple runs in parallel. To have one log file per run, it would be useful to set a custom logging dir and logfile name in the function logger_setup in cellpose/io.py.
I've added the optional params cp_path and logfile_name with the default values ".cellpose" and "run.log" (same values that are harcoded in the code)

[carsen-stringer]

thanks! I am also adding the train and test loss as outputs from train.train_seg

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.97%. Comparing base (49d462b) to head (5f2f541).
Report is 55 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #862      +/-   ##
==========================================
- Coverage   56.00%   52.97%   -3.03%     
==========================================
  Files          17       18       +1     
  Lines        3875     4119     +244     
==========================================
+ Hits         2170     2182      +12     
- Misses       1705     1937     +232     

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