RFR: 8327786: Add fluent setAccessible()

[Sergey]

The feature allows to extract a private field value in a single expression, like so:

object.getClass().getDeclaredField().setAccessible().get(object)

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Commit messages:
 - Add functional-style setAccessible()

Changes: https://git.openjdk.org/jdk/pull/17578/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17578&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327786
  Stats: 10 lines in 1 file changed: 10 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17578.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17578/head:pull/17578

PR: https://git.openjdk.org/jdk/pull/17578