pile/wikitext: add testdata

tests/testdata/pile_wikipedia-v1-loglikelihood_rolling

+ef9ec0dd408316ca6537228a6812e839f14b30608973081d41efc47c138338da
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tests/testdata/pile_wikipedia-v1-res.json

+{"results": {"pile_wikipedia": {"bits_per_byte": 0.00024287370359008176, "byte_perplexity": 1.0001683613940646, "word_perplexity": 1.001084677949439}}, "versions": {"pile_wikipedia": 1}}
\ No newline at end of file

tests/testdata/pile_youtubesubtitles-v1-loglikelihood_rolling

+68263c52adc0086011e2220b619983935cabb1cc1f5f9f8ee1a74ab2a7457967
\ No newline at end of file

tests/testdata/pile_youtubesubtitles-v1-res.json

+{"results": {"pile_youtubesubtitles": {"bits_per_byte": 3.3827117222045906e-05, "byte_perplexity": 1.000023447445816, "word_perplexity": 1.0001529192262875}}, "versions": {"pile_youtubesubtitles": 1}}
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tests/testdata/wikitext-v1-loglikelihood_rolling

+b6f83e6cf7535ee41b0057c3e2ec2cf7f2fa5a9119b305c479a83091d1142b2c
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tests/testdata/wikitext-v1-res.json

+{"results": {"wikitext": {"bits_per_byte": 3.202519859941674e-05, "byte_perplexity": 1.0000221984224973, "word_perplexity": 1.000118710696617}}, "versions": {"wikitext": 1}}
\ No newline at end of file