Add mutual v1 test data

tests/testdata/mutual-v1-loglikelihood

+f759213a28f0412510bf1a24c9cab0dae64bdee902d42a26225295445e7779db
\ No newline at end of file

tests/testdata/mutual-v1-res.json

+{"results": {"mutual": {"mrr": 0.5023513920240772, "mrr_stderr": 0.009501864812936679, "r@1": 0.22460496613995484, "r@1_stderr": 0.014028122493992806, "r@2": 0.4706546275395034, "r@2_stderr": 0.016778343895001414}}, "versions": {"mutual": 1}}
\ No newline at end of file

tests/testdata/mutual_plus-v1-loglikelihood

+b846bb9db109535f59a93d1ce340cf09f68bdf4fed5b8decd168784220fe07fa
\ No newline at end of file

tests/testdata/mutual_plus-v1-res.json

+{"results": {"mutual_plus": {"mrr": 0.5275583145221953, "mrr_stderr": 0.009940894824430708, "r@1": 0.26297968397291194, "r@1_stderr": 0.01479889176605113, "r@2": 0.5, "r@2_stderr": 0.01680731613632036}}, "versions": {"mutual_plus": 1}}
\ No newline at end of file