test: rework SPARQL test suite

[aucampia]

Summary of changes

This patch reworks the SPARQL test suite to use the new DAWG manifest
processor. The actual checker is also more accurate, correctly reporting
negative tests and more correctly checking the results of positive
tests.

Some of the tests that were not executed before are still
being skipped, but they will now correctly report as skipped.

Other changes:

• Fixed test/data/suites/rdflib/sparql/unicode.srx. This file did not
  have the correct content for the query. I verified this with Apache Jena.

Checklist

• Checked that there aren't other open pull requests for
  the same change.
• Checked that all tests and type checking passes.
• Considered granting push permissions to the PR branch,
  so maintainers can fix minor issues and keep your PR up to date.

[coveralls]

Coverage increased (+0.03%) to 88.555% when pulling c6a0a09 on aucampia:iwana-20220605T1943-rework_sparql_test into 60ff2fd on RDFLib:master.

[aucampia]

Check that EARL report matches pytest report:

$ task test -- test/test_w3c_spec/test_sparql11_w3c.py --tb=native
task: [test]  .venv/bin/python -m pytest  test/test_w3c_spec/test_sparql11_w3c.py '--tb=native'
============================================================================ test session starts ============================================================================
platform linux -- Python 3.10.4, pytest-7.1.2, pluggy-1.0.0
rootdir: /home/iwana/sw/d/github.com/iafork/rdflib, configfile: pyproject.toml
plugins: subtests-0.7.0, cov-3.0.0
collected 547 items                                                                                                                                                         

test/test_w3c_spec/test_sparql11_w3c.py ...............x.xxxx............x...................................................x.x..................................... [ 22%]
........x...x....x...xxxxxxx.xxx.....xxxxx...........xx......xxxx..xxxxxxxxxxxxxxxx.....x.x..............................................................xx.......... [ 53%]
.........................................xsssssss......................................................xxx.............xxx..x........................................ [ 83%]
..........................xx.....xxx.x.................sssssssssssssssssssssssssssssssssssss                                                                          [100%]

============================================================================= warnings summary ==============================================================================
test/test_w3c_spec/test_sparql11_w3c.py: 50 warnings
  /home/iwana/sw/d/github.com/iafork/rdflib/rdflib/term.py:1139: DeprecationWarning: NotImplemented should not be used in a boolean context
    return not self.__gt__(other) and not self.eq(other)

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
========================================================= 437 passed, 44 skipped, 66 xfailed, 50 warnings in 7.43s ==========================================================
$ sparql --results=CSV \
> $(find test/data/suites/w3c/sparql11/ -name 'manifest*' -printf '--data %p ') --data test_reports/rdflib_w3c_sparql11-latest.ttl \
> --query <(echo '
> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
> PREFIX mf: <http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#>
> PREFIX earl: <http://www.w3.org/ns/earl#>
> SELECT DISTINCT ?entry ?outcome WHERE {
>   ?manifest rdf:type mf:Manifest.
>   ?manifest mf:entries ?entries.
>   ?entries rdf:rest*/rdf:first ?entry.
>   OPTIONAL {
>     ?assertion earl:test ?entry.
>     ?assertion earl:result / earl:outcome ?outcome.
>   }
> }') \
> | sed 1d | gawk -F, '{ print $2 }' | sort | uniq -c
     66 http://www.w3.org/ns/earl#failed
    437 http://www.w3.org/ns/earl#passed
     44 http://www.w3.org/ns/earl#untested

[ghost]

rockin'

[ajnelson-nist]

@aucampia - whoops, looks like a citation was truncated.

[ghost]

AFAICT, the relevant (resolvable) URL is https://www.w3.org/2001/sw/DataAccess/tests/data-r2