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ARROW-12153: [Rust] [Parquet] Return file stats after writing file

The stats are useful for some writers who need to perform
book-keeping of files writte.

Closes #9850 from nevi-me/ARROW-12153

Authored-by: Neville Dipale <nevilledips@gmail.com>
Signed-off-by: Neville Dipale <nevilledips@gmail.com>