feature #15131 [Security] Moved Simple{Form,Pre}AuthenticatorInterfaces to Security\Http (WouterJ)

This PR was squashed before being merged into the 2.8 branch (closes #15131).

Discussion
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[Security] Moved Simple{Form,Pre}AuthenticatorInterfaces to Security\Http

Description
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The `SimpleFormAuthenticatorInterface` and `SimplePreAuthenticatorInterface` rely on `Request`, which means it's a Http land class. This means they don't belong in core.

Having a form login that doesn't depend on the request is an option as well (e.g. a console application might use the question helper to implement a "form" login). However, then there is a need for a new abstraction of the request. I don't think it's worth it.

Furthermore, the only classes typehinting/relying on this interfaces can be found in `Security\Http`.

Implementation
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The new interfaces extend the old ones for better backwards compability. Symfony doesn't trigger deprecation errors for interfaces, see symfony/symfony@6f57b7b

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

Commits
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ebb2064 [Security] Moved Simple{Form,Pre}AuthenticatorInterfaces to Security\Http

Author: fabpot

Authentication/SimpleFormAuthenticatorInterface.php

@@ -14,6 +14,8 @@
 use Symfony\Component\HttpFoundation\Request;
 
 /**
+ * @deprecated Deprecated since version 2.8, to be removed in 3.0. Use the same interface from Security\Http\Authentication instead.
+ *
  * @author Jordi Boggiano <j.boggiano@seld.be>
  */
 interface SimpleFormAuthenticatorInterface extends SimpleAuthenticatorInterface

Authentication/SimplePreAuthenticatorInterface.php

@@ -14,6 +14,8 @@
 use Symfony\Component\HttpFoundation\Request;
 
 /**
+ * @deprecated Since version 2.8, to be removed in 3.0. Use the same interface from Security\Http\Authentication instead.
+ *
  * @author Jordi Boggiano <j.boggiano@seld.be>
  */
 interface SimplePreAuthenticatorInterface extends SimpleAuthenticatorInterface