feat: solid override

[nank1ro]

Implement the SolidOverride widget to easily mock providers regardless of their position in the widget tree.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (141e960) to head (31fae5e).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##               dev       #93   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           20        21    +1     
  Lines         1166      1191   +25     
=========================================
+ Hits          1166      1191   +25     

Files with missing lines	Coverage Δ
...flutter_solidart/lib/src/models/solid_element.dart	100.00% <ø> (ø)
...ckages/flutter_solidart/lib/src/widgets/solid.dart	100.00% <100.00%> (ø)
...utter_solidart/lib/src/widgets/solid_override.dart	100.00% <100.00%> (ø)
packages/solidart/lib/src/core/effect.dart	100.00% <100.00%> (ø)

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