Model-based widget creation

[tlambert03]

quite similar to #318 ... this pattern would use pydantic directly in widget declaration:

from magicgui import Field, GUIModel
from magicgui.widgets import Slider

# this is a pydantic subclass
class MyWidget(GUIModel):
    x: int = 1
    # magicgui kwargs are prefaced by ui_
    y: int = Field(2, ui_widget_type=Slider)

    class Config:
        #container kwargs in the config
        layout = "horizontal"


obj = MyWidget()
obj.x  # values are directly on the object, like pydantic
obj.events.x.connect  # events are in a psygnal group
obj.gui.show(run=True)  # the widget is at the `.gui` attribute

[codecov[bot]]

Codecov Report

Merging #379 (519e2a7) into main (876190a) will decrease coverage by 2.33%. The diff coverage is 4.08%.

@@            Coverage Diff             @@
##             main     #379      +/-   ##
==========================================
- Coverage   88.64%   86.30%   -2.34%     
==========================================
  Files          30       31       +1     
  Lines        3804     3900      +96     
==========================================
- Hits         3372     3366       -6     
- Misses        432      534     +102     

Impacted Files	Coverage Δ
magicgui/_gui_model.py	0.00% <0.00%> (ø)
magicgui/types.py	97.67% <80.00%> (-2.33%)	:arrow_down:
magicgui/_type_wrapper.py	65.70% <0.00%> (-2.53%)	:arrow_down:
magicgui/widgets/_table.py	96.06% <0.00%> (-0.25%)	:arrow_down:

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[tlambert03]

closing this in favor of #446