Add test file for floating types with different column orders and nan_counts

data/README.md

@@ -48,6 +48,7 @@
 | large_string_map.brotli.parquet       | MAP(STRING, INT32) with a string column chunk of more than 2GB. See [note](#large-string-map) below |
 | float16_nonzeros_and_nans.parquet | Float16 (logical type) column with NaNs and nonzero finite min/max values |
 | float16_zeros_and_nans.parquet    | Float16 (logical type) column with NaNs and zeros as min/max values. . See [note](#float16-files) below |
+| floating_orders_nan_count.parquet | FLOAT/DOUBLE/FLOAT16 columns in IEEE754 and TypeDefined orders across five row groups (no-NaN, mixed-NaN, all-NaN, zero-min, zero-max) to validate nan_count, signed NaNs, and IEEE-754 zero ordering in statistics and column index |
 | concatenated_gzip_members.parquet     | 513 UINT64 numbers compressed using 2 concatenated gzip members in a single data page |
 | byte_stream_split.zstd.parquet | Standard normals with `BYTE_STREAM_SPLIT` encoding. See [note](#byte-stream-split) below |
 | incorrect_map_schema.parquet | Contains a Map schema without explicitly required keys, produced by Presto. See [note](#incorrect-map-schema) |