John Snow d646b2a128 qapi/common.py: add type hint annotations
Annotations do not change runtime behavior.
This commit *only* adds annotations.

Note that build_params() cannot be fully annotated due to import
dependency issues.  The commit after next will take care of it.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Cleber Rosa <crosa@redhat.com>
Message-Id: <20201009161558.107041-16-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
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