[data.shenzhen] Decompress JSON files for ease of use

src/ptbench/data/shenzhen/default.json

src/ptbench/data/shenzhen/default.json.bz2

src/ptbench/data/shenzhen/fold_0.json

src/ptbench/data/shenzhen/fold_0.json.bz2

src/ptbench/data/shenzhen/fold_1.json

src/ptbench/data/shenzhen/fold_1.json.bz2

src/ptbench/data/shenzhen/fold_2.json

src/ptbench/data/shenzhen/fold_2.json.bz2

src/ptbench/data/shenzhen/fold_3.json

src/ptbench/data/shenzhen/fold_3.json.bz2

src/ptbench/data/shenzhen/fold_4.json

src/ptbench/data/shenzhen/fold_4.json.bz2

src/ptbench/data/shenzhen/fold_5.json

src/ptbench/data/shenzhen/fold_5.json.bz2

src/ptbench/data/shenzhen/fold_6.json

src/ptbench/data/shenzhen/fold_6.json.bz2

src/ptbench/data/shenzhen/fold_7.json

src/ptbench/data/shenzhen/fold_7.json.bz2

src/ptbench/data/shenzhen/fold_8.json

src/ptbench/data/shenzhen/fold_8.json.bz2