Add stub for symfony 6 (#234)

src/Stubs/6/Bundle/FrameworkBundle/Controller/AbstractController.stubphp

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+<?php
+
+namespace Symfony\Bundle\FrameworkBundle\Controller;
+
+use Symfony\Contracts\Service\ServiceSubscriberInterface;
+use Psr\Container\ContainerInterface;
+use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormTypeInterface;
+
+class AbstractController implements ServiceSubscriberInterface
+{
+    /**
+     * @var ContainerInterface
+     * @psalm-suppress PropertyNotSetInConstructor
+     */
+    protected $container;
+
+    /**
+     * @template TData
+     * @template TFormType of FormTypeInterface<TData>
+     *
+     * @psalm-param class-string<TFormType> $type
+     *
+     * @psalm-return FormInterface<TData>
+     */
+    public function createForm(string $type, $data = null, array $options = []): FormInterface {}
+}

src/Stubs/6/Component/HttpFoundation/InputBag.stubphp

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+<?php
+
+namespace Symfony\Component\HttpFoundation;
+
+final class InputBag extends ParameterBag
+{
+    /**
+     * Returns a string input value by name.
+     *
+     * @template D of string|int|float|bool|null
+     * @psalm-param D $default
+     * @psalm-return string|int|float|bool|D
+     * @psalm-taint-source input
+     */
+    public function get(string $key, $default = null) {}
+
+    /**
+     * Returns the parameters.
+     *
+     * @param string|null $key The name of the parameter to return or null to get them all
+     *
+     * @return array An array of parameters
+     *
+     * @psalm-taint-source input
+     */
+    public function all(string $key = null) {}
+}

src/Stubs/6/Component/HttpFoundation/ParameterBag.stubphp

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+<?php
+
+namespace Symfony\Component\HttpFoundation;
+
+class ParameterBag implements \IteratorAggregate, \Countable
+{
+    /**
+     * Returns a parameter by name.
+     *
+     * @param string $key     The key
+     * @param mixed  $default The default value if the parameter key does not exist
+     *
+     * @return mixed
+     * @psalm-taint-source input
+     */
+    public function get(string $key, $default = null) {}
+
+    /**
+     * Returns the parameters.
+     *
+     * @param string|null $key The name of the parameter to return or null to get them all
+     *
+     * @return array An array of parameters
+     *
+     * @psalm-taint-source input
+     */
+    public function all(string $key = null) {}
+}

src/Stubs/6/Component/HttpFoundation/Request.stubphp

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+<?php
+
+namespace Symfony\Component\HttpFoundation;
+
+class Request
+{
+    /**
+     * @psalm-var InputBag
+     */
+    public $request;
+}