Add overrideWith

[rrousselGit]

resolves #1806

[codecov]

Codecov Report

Merging #1839 (3592123) into master (1883856) will increase coverage by 0.42%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1839      +/-   ##
==========================================
+ Coverage   95.05%   95.47%   +0.42%     
==========================================
  Files          49       49              
  Lines        1899     2055     +156     
==========================================
+ Hits         1805     1962     +157     
+ Misses         94       93       -1     

Impacted Files	Coverage Δ
...lib/src/change_notifier_provider/auto_dispose.dart	100.00% <100.00%> (ø)
...iverpod/lib/src/change_notifier_provider/base.dart	100.00% <100.00%> (ø)
.../riverpod/lib/src/async_notifier/auto_dispose.dart	100.00% <100.00%> (ø)
...od/lib/src/async_notifier/auto_dispose_family.dart	100.00% <100.00%> (ø)
packages/riverpod/lib/src/async_notifier/base.dart	100.00% <100.00%> (ø)
...ckages/riverpod/lib/src/async_notifier/family.dart	100.00% <100.00%> (ø)
packages/riverpod/lib/src/framework/family.dart	100.00% <100.00%> (ø)
...riverpod/lib/src/future_provider/auto_dispose.dart	100.00% <100.00%> (ø)
...ackages/riverpod/lib/src/future_provider/base.dart	100.00% <100.00%> (ø)
...ckages/riverpod/lib/src/notifier/auto_dispose.dart	100.00% <100.00%> (ø)
... and 12 more