Support multistring phpdoc for `shape`

[Danil42Russia]

Example code:

<?php

/**
 * @return shape(
 *     uuid?: string,
 *     id: int,
 *  )
 */
function test_shape() {
  return shape([
    'uuid' => 'sss',
    'id'   => 1,
  ]);
}

Expectation reality: No errors in compilation

Actual reality: error during compilation

  another.php:9  in test_shape
    function test_shape() {

Could not parse @return: shape(
expected ':'

[Danil42Russia]

Will be done together with #538