RFR: 8319123: Implement JEP 461: Stream Gatherers (Preview) [v12]

[Viktor Klang]

On Fri, 17 Nov 2023 13:11:13 GMT, Viktor Klang <vklang at openjdk.org> wrote:

>> This Pull-Request implements [JEP-461](https://openjdk.org/jeps/461)
>
> Viktor Klang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Addressing trailing whitespace complaint

src/java.base/share/classes/java/util/stream/Gatherer.java line 118:

> 116:  * }
> 117:  *
> 118:  * <p>As an example, a Gatherer implementing a sequential Prefix Scan could

@AlanBateman @PaulSandoz Somehow having a trailing space after "Scan" was preventing integration-ability of this PR. Apologies.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16420#discussion_r1397281491