Constrained integers

[mristin]

In the current state, aas-core-codegen supports integer primitives although they are not part of the official meta-model yet. If the integers become part of the meta-model, we have to make sure that they are all constrained to the range [-2^53 + 1, 2^53 - 1], i.e. [-9007199254740991, 9007199254740991], (both inclusive) so that the JSON format is interoperable with XML and other formats.

JSON intrinsically represents numbers as 64-bit floats, so there might be silent precision loss.

Such a constraint can be implemented by a unit test in aas-core-meta which checks that all integers are constrained, similar to how we check that all strings are serializable to XML.