RFR: 8275840: Add test to java/nio/channels/Channels/TransferTo.java to test transfer sizes > 2GB [v2]

[Markus KARG]

On Tue, 26 Oct 2021 06:59:35 GMT, Markus KARG <duke at openjdk.java.net> wrote:

>> Testing `FileChannel.transferTo(FileChannel)` with more than 2 GB of data is covering the case that *multiple* iterations of `FileChannel.transferTo(FileChannel)` are actually performed by the test.
>> 
>> This change was requested Alan Bateman @AlanBateman.
>
> Markus KARG has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Also it would be better to use constants.
>  - It would probably be better to use a try-with-resources statement here to cleanly close the streams.

All requested changes are done meanwhile. If no more changes are needed, I kindly like to request approvial of this PR. :-)

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PR: https://git.openjdk.java.net/jdk/pull/6093