feature #60028 [ObjectMapper] Condition to target a specific class (soyuka)

This PR was squashed before being merged into the 7.3 branch.

Discussion
----------

[ObjectMapper] Condition to target a specific class

| Q             | A
| ------------- | ---
| Branch?       | 7.3
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| License       | MIT

We want to be able to choose which property to map according to the target. Here `foo` is mapped to `B` only when the target is `B`. If `C` has a `foo` property it won't be mapped as we only map to `bar`.

```php
use Symfony\Component\ObjectMapper\Attribute\Map;
use Symfony\Component\ObjectMapper\TargetClass;

#[Map(target: B::class)]
#[Map(target: C::class)]
class A
{
    #[Map(target: 'foo', transform: 'strtoupper', if: new TargetClass(B::class))]
    #[Map(target: 'bar')]
    public string $something = 'test';

    public string $doesNotExistInTargetB = 'foo';
}
```

This is a good alternative to groups as we can have one class that has multiple representation.

Commits
-------

a5698aaf88f [ObjectMapper] Condition to target a specific class

Author: fabpot

Tests/Fixtures/ObjectMapper/TransformCallable.php

@@ -18,7 +18,7 @@
  */
 final class TransformCallable implements TransformCallableInterface
 {
-    public function __invoke(mixed $value, object $object): mixed
+    public function __invoke(mixed $value, object $source, ?object $target): mixed
     {
         return 'transformed';
     }