docs/qapidoc: prepare to record entity being transmogrified

Prepare to keep a record of which entity we're working on documenting
for the purposes of being able to change certain generative features
conditionally and create stronger assertions.

If you find yourself asking: "Wait, but where does the current entity
actually get recorded?!", you're right! That part comes with the
visit_entity() implementation, which gets added later.

This patch is front-loaded for the sake of type checking in the
forthcoming commits before visit_entity() is ready to be added.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20250311034303.75779-50-jsnow@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

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