RFR: 8327796: Add method to java.net.http.HttpRequest to return a GET request in one call

[Michael McMahon]

Hi,

This PR proposes to add simple utility method which returns a simple GET HttpRequest in one call. The current builder pattern requires 4 (or 3 since GET is the default method) method calls to achieve the same effect.

Thanks,
Michael

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Commit messages:
 - Copyright
 - remove whitespace
 - update
 - update
 - initial impl

Changes: https://git.openjdk.org/jdk/pull/18227/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18227&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327796
  Stats: 160 lines in 2 files changed: 155 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/18227.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18227/head:pull/18227

PR: https://git.openjdk.org/jdk/pull/18227