Next:
- Implement the builder

* It inherits from normal Ransack::Helpers::FormBuilder
* It composes with an instance of SimpleForm:Builder,
  so it may delegate methods like SimpleForm "input"

Next:
- Extract "label_text"
- Resolve simple_form dependency

This allows SimpleForm to use the correct label like
  "name_cont" -> "Name contains"

It will not be "required" by default.
So it doesn't increases gem's size.

It checks if SimpleForm#input method is callable.
And checks for correct wrapping of a normal text field.

It should generate boolean fields whe the predicate is boolean.
  e.g.: _blank, _present, _true, _not_null

It should respect the type of the ActiveRecord attribute otherwise.
  e.g.: Generate the proper date field for date attributes.

Integrating with existing methods,
even those not designated as 'public API',
to minimize code duplication and maintain compatibility with future changes.