Add contentInsertionConfiguration property to FormBuilderTextField

[deandreamatias]

Connection with issue(s)

Close #1199

Thanks @AmitSonkhiya

Solution description

• Added property

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

[codecov]

Codecov Report

Merging #1248 (de8dd2a) into main (94d277a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1248   +/-   ##
=======================================
  Coverage   85.12%   85.12%           
=======================================
  Files          20       20           
  Lines         706      706           
=======================================
  Hits          601      601           
  Misses        105      105           

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

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