add way to cancel inputrules and pasterules

[philippkuehn]

With this PR it’s possible to cancel inputRules and pasteRules. The issue is also described in #2225.

new InputRule({
  handler: ({ state, range, match }) => {
    // cancel input rule when returning `null`
    if (true) {
      return null
    }

    // ...
  }
})

Caveat

Pasterules work slightly differently because a match can appear in several nodes at the same time. When returning null, the rule for all occurrences is not applied.

fixes #2348

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