Reintroduce ability to validate form field's value independent of input's error text

[lreardon]

Connection with issue(s)
Close #1348

Connected to

Solution description
To avoid breaking changes, implemented valueIsValid and valueHasError getters on FormBuilderFieldState which perform the behavior of the overridden isValid and hasError getters of FormFieldState.

To Do

• Read contributing guide
• Check the original issue to confirm it is fully satisfied
• Add solution description to help guide reviewers
• Add unit test to verify new or fixed behavior
• If apply, add documentation to code properties and package readme

[lreardon]

@deandreamatias This issue relates to the overrides of isValid and hasError that you implemented 8 months ago. In doing so, the package seems to have lost the ability to assess the validity of an input's value independent of the errorText.

This pull request reintroduces the ability to assess the validity of an input's value independent of the errorText while preserving the overrides you wrote to ensure there are no breaking changes.

[lreardon]

Ran dart format .

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (04660f1) 87.71% compared to head (6e55bbf) 87.74%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1342      +/-   ##
==========================================
+ Coverage   87.71%   87.74%   +0.03%     
==========================================
  Files          21       21              
  Lines         757      759       +2     
==========================================
+ Hits          664      666       +2     
  Misses         93       93              

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