Non-blocking IO for ImageTool manager

[kmnhan]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.93805% with 150 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@d9524c1). Learn more about missing BASE report.
Report is 18 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...erlab/interactive/imagetool/manager/_mainwindow.py	87.92%	78 Missing ⚠️
.../erlab/interactive/imagetool/manager/_modelview.py	85.71%	45 Missing ⚠️
...rc/erlab/interactive/imagetool/manager/_wrapper.py	91.03%	19 Missing ⚠️
src/erlab/interactive/imagetool/_mainwindow.py	81.81%	4 Missing ⚠️
src/erlab/interactive/imagetool/manager/_io.py	97.59%	2 Missing ⚠️
src/erlab/interactive/imagetool/core.py	96.66%	1 Missing ⚠️
src/erlab/interactive/imagetool/manager/_server.py	97.22%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage        ?   83.39%           
=======================================
  Files           ?       80           
  Lines           ?    13583           
  Branches        ?        0           
=======================================
  Hits            ?    11328           
  Misses          ?     2255           
  Partials        ?        0           

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