Added multiple style props to the button widget:
- Button styles
- The background colour can change with a hex code
- elevation (box-shadow & colour)
- There are button variant contained (solid button), outlined (only borders), text (text buttons)
- Button can have an end icon or start icon
- Prefill datasource title
- Decrease field width
- Save button should have loading state
- Back button in form screen
- Right align save button
- Add new plugin images
and other fixes
