Replace find_object_proxies with a class

[ckunki]

Background

• find_object_proxies suffered from a reuse of ids of temporary objects, which led to incomplete traversals of the object tree and with that to not found object proxies
• To avoid this in the future, the following things are necessary
  • We need to keep all seen objects in a list to prevent the release of a temporary object until the function ends.
  • We need to implement limits on the depth and the number of seen objects to prevent to high memory use
  • We have to make sure the algorithm itself doesn't produce temporary objects.
  • Extract it to a class and a factory, to make it injectable and to make state handling easier. Through injection, we can also version with reporting for debugging.

[ckunki]

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