ARROW-12956: Add Parquet fuzz regression file (#61)

diff --git a/data/parquet/fuzzing/clusterfuzz-testcase-parquet-arrow-fuzz-6702965604876288 b/data/parquet/fuzzing/clusterfuzz-testcase-parquet-arrow-fuzz-6702965604876288
new file mode 100644
index 0000000..062011f
--- /dev/null
+++ b/data/parquet/fuzzing/clusterfuzz-testcase-parquet-arrow-fuzz-6702965604876288
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