feat: deserialization should ignore unregistered elements

[jkowalleck]

current behavior

• XML deserialization passes any element to the object creation - causing feat: load XML with ##other elements and ##any attributes CycloneDX/cyclonedx-python-lib#850
• Probably the same with any attribute
• Probably the same with any JSON property

desired behavior

• deserialization passes only those things, that are mapped to a property in the python object.

possible implementation

• @py_serializable.serializable_class gets a parameter, that controls whether to "drop" anything that is "unknonw" property of the class
  • parameter is optional, defaults to False

[jkowalleck]

FYI @makew0rld

[jkowalleck]

reading the current implementation

• serializable/py_serializable/__init__.py

  Line 1110 in 3c4011a

  for name, o in getmembers(klass, ObjectMetadataLibrary.is_property):

I get the impression that this feature should not be needed, but the implementation is bugged.

on the first glance, it looks like any unregistered property should be intended to be ignored anyway.

need to dig deeper into this (messy) code and see add some tests, to see what's going on

[jkowalleck]

looking into the details