Added new stamps from symfony 5.2 (#21)

* Added missing properties to Symfonys FlattenException.

* Added symfony 5.1.

* The throwable is an interface, we need a concrete implementation.

* Added ErrorDetailsStamp.

Co-authored-by: Christoph Quadt <quadt@united-domains.de>

src/Resources/config/serializer/Symfony.Component.Messenger.Stamp.ErrorDetailsStamp.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<serializer>
+    <class name="Symfony\Component\Messenger\Stamp\ErrorDetailsStamp" exclusion-policy="ALL">
+        <property name="exceptionClass" type="string" expose="true" />
+        <property name="exceptionCode" type="int" expose="true" />
+        <property name="exceptionMessage" type="string" expose="true" />
+        <property name="flattenException" type="Symfony\Component\ErrorHandler\Exception\FlattenException" expose="true" />
+    </class>
+</serializer>