ARROW-11443: [Rust] Write datetime information for Date64 Type in csv writer
ARROW-11443: [Rust] Write datetime information for Date64 Type in csv writer

`Date64` datatype encodes date and time information in ms. The current csv writer only writes the date, making it impossible to serialize and deserialize whilst retaining the same precision.

This PR proposes to write the date and time information to csv for `Date64` types.

Closes #9379 from ritchie46/csv_writer_date64

Authored-by: Ritchie Vink <fc19543d6b0465ef8ec4a8f998d9b13cff10e422@gmail.com>
Signed-off-by: Andrew Lamb <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@nerdnetworks.org>

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