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ARROW-14072: [GLib][Parquet] Add gparquet_arrow_file_reader_get_n_rows()

Version macros are removed. We reuse Apache Arrow GLib's version
macros for Apache Parquet GLib.

Closes #11215 from kou/glib-parquet-reader-n-rows

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>