Make all imports absolute

[Czaki]

Description

This is an alternative to #5308 where all imports are absolute

Type of change

• Refactor

References

How has this been tested?

• example: the test suite for my feature covers cases x, y, and z
• example: all tests pass with my change
• example: I check if my changes works with both PySide and PyQt backends
  as there are small differences between the two Qt bindings.

Final checklist:

• My PR is the minimum possible work for the desired functionality
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• If I included new strings, I have used trans. to make them localizable.
  For more information see our translations guide.

cc @jni @kephale @goanpeca @psobolewskiPhD

[psobolewskiPhD]

As I posted in the other thread, as a serious newbie I find the ... imports really confusing. When reading code I'm never sure where the import is from. Worse yet, I copy-paste a lot to try functions and such to see what they return and do, because I'm not good at reading the code. Then the .. imports don't work and I need to figure out what was intended.
So from my side, as a newbie, relative outsider, and all-around not-very-smart person: 👍

[codecov]

Codecov Report

Merging #5318 (90fd73a) into main (8a78b3c) will increase coverage by 0.02%.
The diff coverage is 95.57%.

@@            Coverage Diff             @@
##             main    #5318      +/-   ##
==========================================
+ Coverage   89.07%   89.09%   +0.02%     
==========================================
  Files         581      581              
  Lines       49233    49233              
==========================================
+ Hits        43853    43866      +13     
+ Misses       5380     5367      -13     

Impacted Files	Coverage Δ
napari/_app_model/actions/_toggle_action.py	100.00% <ø> (ø)
napari/_app_model/context/_context_keys.py	100.00% <ø> (ø)
napari/_qt/experimental/qt_poll.py	0.00% <0.00%> (ø)
napari/_qt/menus/_util.py	92.45% <ø> (ø)
napari/_qt/widgets/qt_dict_table.py	0.00% <0.00%> (ø)
napari/_vispy/experimental/tile_grid.py	38.46% <ø> (ø)
napari/components/experimental/monitor/_api.py	0.00% <0.00%> (ø)
napari/components/experimental/monitor/_service.py	0.00% <0.00%> (ø)
napari/components/experimental/remote/__init__.py	0.00% <0.00%> (ø)
napari/components/experimental/remote/_commands.py	0.00% <0.00%> (ø)
... and 281 more

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[goanpeca]

Thanks for working on this @Czaki ! 🚀

[jni]

Reading up a bit, it seems that absolute imports are preferred by a large percentage of the Python community, and indeed by our own napari community, so 👍 from me. Thank you @Czaki and also everyone else who has contributed to this discussion!

[brisvag]

This is gonna be a nightmare on all open PRs ^^'

[Czaki]

This is gonna be a nightmare on all open PRs ^^'

pre-commit action will solve most of problems

[Czaki]

Lets the conflicts start.