feat: Update thread to write to mda zarr

[fdrgsp]

followup of #258.

In this PR I've updated the code with the suggestions in #258 + I've added a method (_process_remaining_frames) that is used to add to the zarr layer(s) any frames remaining in _deck after the acquisition is finished. Note that at the moment, since we don't have a proper writer in napari-micromanager this method is called by _on_mda_finished but once we have a writer, we can simply link this method to _io_thread _connect ("finished": self._process_remaining_frames).

To speed up the process it was also necessary to specify the chunk size when creating the zarr.

I did few test on our microscope and this way of handling the acquired images works great!

In addition I've added some fixes for the use of the current pymmcore-widgets (main git branch).
Test failing until new release of pymmcore-widgets.

closes #258.

[tlambert03]

The private _sequence module definitely shouldn't be imported here. Let's talk about what you need to accomplish and make it public if there's no other way

[fdrgsp]

The private _sequence module definitely shouldn't be imported here. Let's talk about what you need to accomplish and make it public if there's no other way

Sure :) I'm doing some tests with your sequencable PR and it's awesome!!! I pushed this commit to not loose the testing progress :)

[ianhi]

In addition I've added some fixes for the use of the current pymmcore-widgets (main git branch).

@fdrgsp can you please make this a separate self contained PR. Wrapping it up in a big PR like this makes it difficult for me to work on other things (and led to me thinking this was an unfixed bug: #268)

[codecov]

Codecov Report

Patch coverage: 65.21% and project coverage change: +2.28% 🎉

Comparison is base (a1e60c6) 75.24% compared to head (39855f2) 77.52%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #264      +/-   ##
==========================================
+ Coverage   75.24%   77.52%   +2.28%     
==========================================
  Files          15       15              
  Lines         820      801      -19     
==========================================
+ Hits          617      621       +4     
+ Misses        203      180      -23     

Files Changed	Coverage Δ
...apari_micromanager/_gui_objects/_cam_roi_widget.py	0.00% <0.00%> (ø)
src/napari_micromanager/_saving.py	64.58% <ø> (+9.58%)	⬆️
src/napari_micromanager/_mda_handler.py	92.30% <85.10%> (+19.91%)	⬆️
..._micromanager/_gui_objects/_illumination_widget.py	100.00% <100.00%> (ø)
...rc/napari_micromanager/_gui_objects/_mda_widget.py	77.77% <100.00%> (+0.63%)	⬆️
src/napari_micromanager/_mda_meta.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[fdrgsp]

closing. Open a simpler version #272.