Features update

[salman-amjad]

This PR includes a few updates:

• Ability to add Any option that will update FormFields state automatically
• User can declare custom InputDecoration
• Option to add delete icon for Chips

{
  `addAnyOption`: true | false, 
  `anyLabel`: 'Any' | String,
  `decorator`: InputDecoration(filled: true) | InputDecoration,
  `optionsDeletable`: true | false
}

[cetorres]

Please fix the conflict, so I can merge your PR.
Thank you.

[salman-amjad]

I've resolved the conflicts and have updated Types as well.
thanks