Add pass option to Editor.nodes

[12joan]

Description
Adds the pass option from Node.nodes to Editor.nodes, making it possible to skip the descendants of certain nodes while keeping the match predicate simple and efficient.

Example

const isUnmarkable = (node: Node) => Element.isElement(node) && node.type === 'code-block';

const markableLeaves = Array.from(Editor.nodes(editor, {
  at: [],
  match: Text.isText,
  // Skips all leaves inside unmarkable nodes
  pass: ([node]) => isUnmarkable(node),
}));

Context
As per the behaviour of Node.nodes, passed nodes may still be returned from Editor.nodes if none of their ancestors were passed. I've modified the test for Node.nodes to make it clearer from reading the test that this is the intended behaviour.

Checks

• The new code matches the existing patterns and styles.
• The tests pass with yarn test.
• The linter passes with yarn lint. (Fix errors with yarn fix.)
• The relevant examples still work. (Run examples with yarn start.)
• You've added a changeset if changing functionality. (Add one with yarn changeset add.)

[changeset-bot]

🦋 Changeset detected

Latest commit: a66a4f2

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

This PR includes changesets to release 1 package

Name	Type
slate	Minor

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