feat(paste): Add paste API (fixes #311)

[nickmccurdy]

What: Add paste API (fixes #311)

Why: The allAtOnce option of type doesn't represent real user interaction intuitively, and we need to fire paste events with the relevant clipboardData

How:

• Extract allAtOnce option from type event into paste event
• Implement clipboardData support upstream Support clipboardData like dataTransfer. dom-testing-library#585
• Add events
  • paste with clipboardData
  • input with matching value
  • focus
• DataTransfer mock objects
  • Consider using in upstream tests

Checklist:

• Documentation
• Tests
• Typings
• Ready to be merged
  

[kentcdodds]

Awesome!

We're not going to better this here, not of you want to make this pull request to my branch on DOM Testing Library, them I'll get it merged asap 🤘