chore: define component prop types & expose Autocomplete's root element

[ruchamahabal]

Basic prop type info was missing for components (not typescript at the moment). Added it for:

• Autocomplete
• Date components (DatePicker, DateTimePicker, DateRangePicker)
• FileUploader
• Card

Also, exposing the root element of Autocomplete for controlling it from the parent component. I need access to template refs (for, you know what...). Accessing $el in this case references a TEXT_NODE, so exposing it explicitly.