[VOTE] Naming of ubl types

[blaggacao]

_ubl_add_address(..., node_name, ...) is actually better named:
_ubl_add_address_type(..., node_name, ...), and so forth, see UBL types:
http://www.datypic.com/sc/ubl21/t-cac_AddressType.html

This introduces a consistent distinction between types and their concrete implementation.
Every type implementation should be linked to the docs (url in the docstring, both UBL 2.0 & UBL 2.1) for convenience for developers.

If this is ok, I can prepare a commit.

Although linting, consider the worthiness of strong conceptual foundations in the code base.

[blaggacao]

/cc @Deiber

[github-actions]

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