Constrainer is not able to handle class_alias()

[jkreller]

I got a quite specific use case within my code, where I create an anonymous class extending another class dynamically.
Our pipelines fail since Spryker's composer-constrainer cannot handle this.

class_alias($class, '\AnyClass'); // value of $class is only known at runtime
$extendedClass = new class () extends \AnyClass { // ...

Executing constrainer throws the following exception:

ReflectionException - Exception: Class "AnyClass@anonymous" does not exist 
in /builds/aci/spryker/spryker-b2c/vendor/spryker-sdk/composer-constrainer/src/SprykerSdk/Zed/ComposerConstrainer/Business/Finder/ExtendedModuleFinder/ExtendedModuleFinder.php (129)

Support for class_alias() should be added.

[jkreller]

I created a pull request to ignore anonymous classes at this point, which seems reasonable to me: #30.
Would resolve the issue for me.