Make Table a ValueWidget

[tlambert03]

closes #356

[codecov]

Codecov Report

Merging #360 (371b7e2) into main (7727732) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #360      +/-   ##
==========================================
+ Coverage   90.30%   90.35%   +0.04%     
==========================================
  Files          29       29              
  Lines        3364     3349      -15     
==========================================
- Hits         3038     3026      -12     
+ Misses        326      323       -3     

Impacted Files	Coverage Δ
magicgui/backends/_qtpy/widgets.py	86.07% <100.00%> (+0.09%)	⬆️
magicgui/widgets/_protocols.py	100.00% <100.00%> (+0.53%)	⬆️
magicgui/widgets/_table.py	96.78% <100.00%> (-0.08%)	⬇️
magicgui/widgets/_bases/widget.py	87.29% <0.00%> (-0.07%)	⬇️
magicgui/widgets/_bases/container_widget.py	92.85% <0.00%> (+0.50%)	⬆️

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