feat: add onTapOutside to FormBuilderTextField

[AlvBarros]

Let me know if there's anything else that needs to be done, or if the solution needs to be fixed in any way.

Connection with issue(s)

Close #1266

Solution description

Simply create a new property TapRegionCallback? onTapOutside, add it to the constructor and then pass it down to the widget.

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 behaviour
• If apply, add documentation to code properties and package readme

[deandreamatias]

Thanks for.your contribution
Please format code to pass pipeline

[AlvBarros]

So I've ran the other steps in the base.yaml in my machine, and everything seems great. I'll pay attention if any other error comes up.

[codecov]

Codecov Report

Merging #1267 (4498e6d) into main (edcebe5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1267   +/-   ##
=======================================
  Coverage   84.96%   84.96%           
=======================================
  Files          20       20           
  Lines         705      705           
=======================================
  Hits          599      599           
  Misses        106      106           

Impacted Files	Coverage Δ
lib/src/fields/form_builder_text_field.dart	90.69% <ø> (ø)

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