Add gestureKey to state

[JCQuintas]

This would allow reusing the same callback without a typescript error by differentiating drag, pinch and all other states.

This PR adds a new gestureKey property to the state.

  const callback = (
    state: Required<State>['drag' |  'move']
  ) => {
    if (state.gestureKey === 'drag') {
      // This is ok!
      console.log(state.tap)
    }
    // Property `tap` does not exist on type
    console.log(state.tap)
  }

  const bind = useGesture({
    onDrag: callback,
    onMove: callback
  })

[changeset-bot]

🦋 Changeset detected

Latest commit: b903203

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@use-gesture/core	Minor
@use-gesture/react	Minor
@use-gesture/vanilla	Minor

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