[DX] [FrameworkBundle] Added Crontoller::isCsrfTokenValid

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |
Nice idea! What about changing `$token` to `$submittedToken` or `$tokenToValidate` (I'm trying to make it more clear what this is) and expanding the PHP doc on each:

```
@param string $id The id used when generating the token
@param string $token The actual token sent with the request that should be validated
```