Add support for newer Doctrine versions

[sstok]

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	yes/no
Deprecations?	yes
Tickets	Fix #326
License	MIT

Todo:

• Update upgrade instructions
• Test in real application

[sstok]

This was needed as the tests were failing, and needs a separate pr.

[sstok]

I can't fix the Elastica failures for the ApiPlatform at this moment.

Some predictions failed:
Double\Doctrine\ORM\QueryBuilder\P4:
  No calls have been made that match:
      Double\Doctrine\ORM\QueryBuilder\P4->setParameter(exact("ids"), exact([3, 1, 5]))
    but expected at least one.
    Recorded `setParameter(...)` calls:
      - setParameter("ids", []) @ lib/ApiPlatform/Elasticsearch/Extension/SearchExtension.php:149
  No calls have been made that match:
      Double\Doctrine\ORM\QueryBuilder\P4->setParameter(exact("id0"), exact(3))
    but expected at least one.
    Recorded `setParameter(...)` calls:
      - setParameter("ids", []) @ lib/ApiPlatform/Elasticsearch/Extension/SearchExtension.php:149
  No calls have been made that match:
      Double\Doctrine\ORM\QueryBuilder\P4->setParameter(exact("id1"), exact(1))
    but expected at least one.
    Recorded `setParameter(...)` calls:
      - setParameter("ids", []) @ lib/ApiPlatform/Elasticsearch/Extension/SearchExtension.php:149
  No calls have been made that match:
      Double\Doctrine\ORM\QueryBuilder\P4->setParameter(exact("id2"), exact(5))
    but expected at least one.
    Recorded `setParameter(...)` calls:
      - setParameter("ids", []) @ lib/ApiPlatform/Elasticsearch/Extension/SearchExtension.php:149
  No calls have been made that match:
      Double\Doctrine\ORM\QueryBuilder\P4->orderBy(exact("order_by"), exact("ASC"))
    but expected at least one.
Double\Elastica\Client\P8:
  No calls expected that match:
      Double\Elastica\Client\P8->request(* [, ...])
    but 1 was made:
      - request("/_search", "POST", ["query" => ["bool" => ["must" => "foo"]], "from" => 1], []) @ vendor/ruflin/elastica/src/Search.php:352
  No calls have been made that match:
      Double\Elastica\Client\P8->request(exact("/_search"), [POST, GET], exact(["query" => ["bool" => ["must" => "foo"]]]), exact([]))
    but expected at least one.
    Recorded `request(...)` calls:
      - request("/_search", "POST", ["query" => ["bool" => ["must" => "foo"]], "from" => 1], []) @ vendor/ruflin/elastica/src/Search.php:352

[sstok]

Ah bingo, QueryBuilder::getFirstResult() no longer returns null, but must return an integer. And because of this setFrom() is called internally, which is different then the expected query.