feature #24297 Feature/doctrine type guesser simple json array support (iluuu1994)

This PR was squashed before being merged into the 4.2-dev branch (closes #24297).

Discussion
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Feature/doctrine type guesser simple json array support

Symfony currently supports doctrine/dbal ~2.4 which has support for both `simple_array` and `json_array`:

44cd77f022
2d183acdf0

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | yes
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

There's technically a small BC break since `simple_array` and `json_array` fields would've been displayed as simple text fields. Is this an acceptable BC break for Symfony 3.4?

Commits
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524bc4b039 Feature/doctrine type guesser simple json array support

src/Symfony/Bridge/Doctrine/CHANGELOG.md

@@ -6,6 +6,7 @@ CHANGELOG
 
  * deprecated injecting `ClassMetadataFactory` in `DoctrineExtractor`,
    an instance of `EntityManagerInterface` should be injected instead
+ * added support for `simple_array` type
 
 4.1.0
 -----

src/Symfony/Bridge/Doctrine/Form/DoctrineOrmTypeGuesser.php

@@ -53,6 +53,7 @@ class DoctrineOrmTypeGuesser implements FormTypeGuesserInterface
 
         switch ($metadata->getTypeOfField($property)) {
             case Type::TARRAY:
+            case Type::SIMPLE_ARRAY:
                 return new TypeGuess('Symfony\Component\Form\Extension\Core\Type\CollectionType', array(), Guess::MEDIUM_CONFIDENCE);
             case Type::BOOLEAN:
                 return new TypeGuess('Symfony\Component\Form\Extension\Core\Type\CheckboxType', array(), Guess::HIGH_CONFIDENCE);