[WIP] feat: add action to StageExplorer to send ROIs to MDAWidget

[fdrgsp]

WIP

NOTE: has to point to pymmcore-widgets main branch until release.

[codecov]

Codecov Report

❌ Patch coverage is 95.28302% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.75%. Comparing base (76024ca) to head (d21074a).

Files with missing lines	Patch %	Lines
src/pymmcore_gui/actions/widget_actions.py	87.50%	4 Missing ⚠️
src/pymmcore_gui/widgets/_stage_explorer.py	98.64%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #149      +/-   ##
==========================================
+ Coverage   81.84%   82.75%   +0.90%     
==========================================
  Files          29       30       +1     
  Lines        1807     1908     +101     
==========================================
+ Hits         1479     1579     +100     
- Misses        328      329       +1     

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