Php-cs-fixer: "fully_qualified_strict_types": support typed properties

[Slamdunk]

Current behavior

 use Foo\Bar;
 use Foo\Bar\Baz;

 class SomeClass
 {
     private \Foo\Bar\Baz $baz;

-    public function doSomething(\Foo\Bar $foo): \Foo\Bar\Baz
+    public function doSomething(Bar $foo): Baz
     {
     }
 }

Expected behavior

 use Foo\Bar;
 use Foo\Bar\Baz;

 class SomeClass
 {
-    private \Foo\Bar\Baz $baz;
+    private Baz $baz;

-    public function doSomething(\Foo\Bar $foo): \Foo\Bar\Baz
+    public function doSomething(Bar $foo): Baz
     {
     }
 }

[julienfalque]

Note: I added the "feature request" label but IMO this should be considered an enhancement and target lowest maintained branch.