Add cancer module (ported from Generation-I dna-seq/just_cancer)

data/cancer/annotations.parquet

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-size 2027277
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+size 2266356

data/cancer/sources.parquet

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-size 6285
+oid sha256:9fa203d92a9504193ebba048b4b96bb0eaec6112d4fd658877d657a7343b3f10
+size 7336

data/cancer/studies.parquet

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-size 694085
+oid sha256:90713eefa158ab99c64b699d90bc9c92d26368cfe94ac07b5c5caa781c336267
+size 713075

data/cancer/weights.parquet

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-size 3230541
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+size 3289856