rust: add a small wrapper around the hashfile code

Our new binary loose object map code avoids needing to be intimately
involved with file handling by simply writing data to an object
implement Write.  This makes it very easy to test by writing to a Cursor
wrapping a Vec for tests, and thus decouples it from intimate knowledge
about how we handle files.

However, we will actually want to write our data to an actual file,
since that's the most practical way to persist data.  Implement a
wrapper around the hashfile code that implements the Write trait so that
we can write our loose object map into a file.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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