Remove input decoration

[deandreamatias]

Solution description

BREAKING CHANGE

Add widget to remove decoration property from core. Now exist two field widgets:

1. FormBuilderField: Refactored. Now don't included decoration property or references to this property
2. FormBuilderFieldDecoration: New. Like the old FormBuilderField

The main goal for this change is made more pure the FormBuilderField. Now in this widget (and others) only need import package:flutter/widgets.dart and no anymore the material package.
This is useful to create field inputs to others platforms or with other styles, like cupertino.

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 #1238 (1b47063) into main (2e69a96) will decrease coverage by 0.10%.
The diff coverage is 91.30%.

@@            Coverage Diff             @@
##             main    #1238      +/-   ##
==========================================
- Coverage   85.77%   85.67%   -0.10%     
==========================================
  Files          20       21       +1     
  Lines         724      733       +9     
==========================================
+ Hits          621      628       +7     
- Misses        103      105       +2     

Impacted Files	Coverage Δ
lib/src/extensions/autovalidatemode_extension.dart	100.00% <ø> (ø)
lib/src/fields/form_builder_checkbox.dart	100.00% <ø> (ø)
lib/src/fields/form_builder_choice_chips.dart	100.00% <ø> (ø)
lib/src/fields/form_builder_date_range_picker.dart	86.11% <ø> (ø)
lib/src/fields/form_builder_dropdown.dart	95.00% <ø> (ø)
lib/src/fields/form_builder_radio_group.dart	92.30% <ø> (ø)
lib/src/fields/form_builder_slider.dart	97.05% <ø> (ø)
lib/src/fields/form_builder_switch.dart	100.00% <ø> (ø)
lib/src/fields/form_builder_text_field.dart	90.69% <ø> (ø)
lib/src/form_builder.dart	75.28% <ø> (ø)
... and 9 more

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