function isOptionalChainingMemberExpression(node) {
  return (
    node.type === 'ChainExpression' &&
    node.expression.type === 'MemberExpression'
  )
}
Check whether the given node is a MemberExpression containing an optional chaining.
e.g.
- `a?.b`
- `a?.b.c`
@param {ASTNode} node The node to check.
@returns {boolean} `true` if the node is a MemberExpression containing an optional chaining.