Add new unexported module T.P.XMLParser.

This exports functions that uses xml-conduit's parser to
produce an xml-light Element or [Content].  This allows
existing pandoc code to use a better parser without
much modification.

The new parser is used in all places where xml-light's
parser was previously used.  Benchmarks show a significant
performance improvement in parsing XML-based formats
(especially ODT and FB2).

Note that the xml-light types use String, so the
conversion from xml-conduit types involves a lot
of extra allocation.  It would be desirable to
avoid that in the future by gradually switching
to using xml-conduit directly. This can be done
module by module.

The new parser also reports errors, which we report
when possible.

A new constructor PandocXMLError has been added to
PandocError in T.P.Error [API change].

Closes #7091, which was the main stimulus.

These changes revealed the need for some changes
in the tests.  The docbook-reader.docbook test
lacked definitions for the entities it used; these
have been added. And the docx golden tests have been
updated, because the new parser does not preserve
the order of attributes.

Add entity defs to docbook-reader.docbook.

Update golden tests for docx.

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