RFR: 8265989: System property for the native character encoding name

[Naoto Sato]

On Wed, 28 Apr 2021 22:24:31 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> After some internal discussion, we thought it was good to expose the native environment's default character encoding, which Charset.defaultCharset() is currently based on. This way applications will have a better migration path after the [JEP 400](https://openjdk.java.net/jeps/400) is implemented, in which Charset.defaultCharset() will return UTF-8, but the value of this new system property will remain intact. A [CSR](https://bugs.openjdk.java.net/browse/JDK-8266075) has been filed with more detailed information.

Unless there is some use case other than for migration, I would not introduce a static method as Alan mentioned.

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PR: https://git.openjdk.java.net/jdk/pull/3777