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ARROW-5439: [Java] Utilize stream EOS in File format

Related to [ARROW-5439](https://issues.apache.org/jira/browse/ARROW-5439).
We currently do not write EOS at the end of a Message stream inside the File format.  As a result, the file cannot be parsed sequentially.  This change prepares for other implementations or future reference features that parse a File sequentially... i.e. without access to seek().

Closes #4966 from tianchen92/ARROW-5439 and squashes the following commits:

cc82b3f6f <tianchen> refactor test
1ebf8d826 <tianchen> ARROW-5439:  Utilize stream EOS in File format

Authored-by: tianchen <niki.lj@alibaba-inc.com>
Signed-off-by: Micah Kornfield <emkornfield@gmail.com>