RFR: 8356255: Add Stable Field Updaters to allow efficient lazy field evaluations

[Per Minborg]

This sketch shows how "Stable Updaters" can be used to create stable computations of `@Stable` fields. Only one updater is needed per class, similar to `AtomicIntegerFieldUpdater`.

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Commit messages:
 - Address comments
 - Document field alignment assumption
 - Add unhecked call test
 - Move raw factories into inner class Raw
 - Add copyright header and revert unintended change
 - Add examples to doc and fix tests
 - Add @Stable for URI and add benchmark
 - Rename classes
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/25040/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25040&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356255
  Stats: 904 lines in 10 files changed: 868 ins; 26 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/25040.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25040/head:pull/25040

PR: https://git.openjdk.org/jdk/pull/25040