RFR: 8364361: [process] java.lang.Process should implement Closeable [v9]

[Roger Riggs]

> The teardown of a Process launched by `ProcessBuilder` includes the closing of streams and ensuring the termination of the process is the responsibility of the caller. The `Process.close()` method provides a clear and obvious way to ensure all the streams are closed and the process terminated.
> 
> The try-with-resources statement is frequently used to open streams and ensure they are closed on exiting the block. By implementing `AutoClosable.close()` the completeness of closing the streams and process termination can be done by try-with-resources.
> 
> The actions of the `close()` method are to close each stream and destroy the process if it has not terminated.

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  The CSR review prompted the expansion of the description of responsibilities
  of subclasses of Process to invoke `super.close()` if overriding the `close()` method.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26649/files
  - new: https://git.openjdk.org/jdk/pull/26649/files/e35b8fc7..bc795509

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26649&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26649&range=07-08

  Stats: 18 lines in 1 file changed: 17 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26649.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26649/head:pull/26649

PR: https://git.openjdk.org/jdk/pull/26649