feature #40384 [DependencyInjection] Implement psr/container 1.1 (derrabus)

This PR was merged into the 5.3-dev branch.

Discussion
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[DependencyInjection] Implement psr/container 1.1

| Q             | A
| ------------- | ---
| Branch?       | 5.x
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | N/A
| License       | MIT
| Doc PR        | N/A

The `psr/container` interfaces have been updated with type declarations. The lack of those is what kept us from adding property type declarations to the `get()` and `has()` methods of our own `ContainerInterface`.

A small BC break is that we have never prevented calling code from passing `null` as the service ID. Even without strict types, this will cause a `TypeError` after my changes. I already had to update `AutowirePass` because of that.

On the other hand, it was neither documented that we allow `null` here nor did the container do anything useful (`has(null)` always resulted in `false` and `get(null)` always returned `null`).

Commits
-------

d9095aa892 [DependencyInjection] Implement psr/container 1.1

Author: fabpot

Test/TestContainer.php

@@ -93,15 +93,15 @@ public function set(string $id, $service)
     /**
      * {@inheritdoc}
      */
-    public function has($id): bool
+    public function has(string $id): bool
     {
         return $this->getPublicContainer()->has($id) || $this->getPrivateContainer()->has($id);
     }
 
     /**
      * {@inheritdoc}
      */
-    public function get($id, int $invalidBehavior = /* self::EXCEPTION_ON_INVALID_REFERENCE */ 1): ?object
+    public function get(string $id, int $invalidBehavior = /* self::EXCEPTION_ON_INVALID_REFERENCE */ 1): ?object
     {
         return $this->getPrivateContainer()->has($id) ? $this->getPrivateContainer()->get($id) : $this->getPublicContainer()->get($id, $invalidBehavior);
     }