feat: add DropdownField component

[leonelv]

Description

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of Changes

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[leonelv]

just a proof on concept for an use case that i need to cover, will complete the pr info soon

[leonelv]

casted from example on https://www.verygoodsecurity.com/docs/vgs-collect/js/integration

form.field('#space-for-my-field', {
  type: 'dropdown',
  name: 'car.manufacturer',
  placeholder:"Car manufacturer",
  options: [
      {value: 'volvo', text: 'Volvo'},
      {value: 'saab', text: 'Saab'},
      {value: 'opel', text: 'Opel'},
      {value: 'audi', text: 'Audi'}
  ],
  defaultValue: "volvo",
  validations: ['required']
});