feat(masked-input): add save_unmasked option to submit raw value

[karinevieira]

Adds a save_unmasked option to MaskedInput that, when enabled, submits the raw (unformatted) value instead of the masked one.

Why

Previously, masked inputs would submit the formatted value to theserver (e.g., 1111 2222 instead of 11112222), requiring a custom Stimulus controller wrapper as a workaround. This brings the behavior natively into the component.

How

When save_unmasked: true is passed:

• The visible input renders without a name attribute (so it's not submitted)
• A hidden input with the original name is rendered as its next sibling
• The Stimulus controller listens to the maska event and syncs event.detail.unmasked to the hidden input on every keystroke

Usage

MaskedInput(
  name: "iban",
  value: @record.iban,
  save_unmasked: true,
  data: { maska: "SSSS SSSS SSSS SSSS", maska_tokens: "S:[A-Z0-9]" }
)