Add MuTual test data

tests/testdata/mutual-v0-loglikelihood

+f759213a28f0412510bf1a24c9cab0dae64bdee902d42a26225295445e7779db
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tests/testdata/mutual-v0-res.json

+{"results": {"mutual": {"mrr": 0.5023513920240772, "mrr_stderr": 0.009501864812936679, "r@1": 0.22573363431151242, "r@1_stderr": 0.014053085820407457, "r@2": 0.4221218961625282, "r@2_stderr": 0.016602191705517556}}, "versions": {"mutual": 0}}
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tests/testdata/mutual_plus-v0-loglikelihood

+b846bb9db109535f59a93d1ce340cf09f68bdf4fed5b8decd168784220fe07fa
\ No newline at end of file

tests/testdata/mutual_plus-v0-res.json

+{"results": {"mutual_plus": {"mrr": 0.5275583145221953, "mrr_stderr": 0.009940894824430708, "r@1": 0.2595936794582393, "r@1_stderr": 0.014737047402750955, "r@2": 0.45372460496614, "r@2_stderr": 0.01673517854461967}}, "versions": {"mutual_plus": 0}}
\ No newline at end of file