enh: add test data

nireports/tests/data/ds000114_singleshell.bval

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nireports/tests/data/ds000114_singleshell.bvec

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nireports/tests/data/ds004737_dsi.bval

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nireports/tests/data/ds004737_dsi.bvec

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nireports/tests/data/hcph_multishell.bval

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nireports/tests/data/hcph_multishell.bvec

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