Generate serialized name (a name with profile prefix) in the document

[bact]

When writing objects, pay attention to which profile the property is defined in, as that sets the prefix (the documentation should make it clear what the serialized name of a property is if you are unsure TODO: It does not yet).

From a TODO in Getting started writing SPDX 3 document.

[bact]

Not sure what is a preferable approach in making this, I come up with two to choose from:

1st approach:

• Serialized names are pre-computed during the Model loading
• Defined in model.py: self.serialized_name in Class, Property, Vocabulary, Datatype classes
• Code: https://github.com/bact/spec-parser/tree/add-serialized-name-as-metadata

2nd approach:

• Serialized names are computed at the time they are being called in the templates
• Defined in mkdocs.py: serialized_name(name)
• Code: https://github.com/bact/spec-parser/tree/add-serialized-name

I can open a PR, once the decision about coding approach is made here and the decision about the design (where to put the serialized name in the page) is made in spdx/spdx-spec#975

[zvr]

This is only relevant for JSON-LD serialization. I doubt we want to have each and every serialization format present in the model cards.