RFR: 8349206: j.u.l.Handler classes create deadlock risk via synchronized publish() method [v7]

[David Beaumont]

> 8349206: j.u.l.Handler classes create deadlock risk via synchronized publish() method.
> 
> 1. Remove synchronization of calls to publish() in Handlers in java.util.logging package.
> 2. Add explanatory comments to various affected methods.
> 3. Add a test to ensure deadlocks no longer occur.
> 
> Note that this change does not address issue in MemoryHandler (see JDK-8349208).

David Beaumont has updated the pull request incrementally with one additional commit since the last revision:

  Rewording notes and spec changes in docs.
  Small change to read formatter once in streamhander methods.
  Reverting Formatter doc changes for now.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23491/files
  - new: https://git.openjdk.org/jdk/pull/23491/files/19e84728..35984b09

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23491&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23491&range=05-06

  Stats: 65 lines in 3 files changed: 12 ins; 43 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/23491.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23491/head:pull/23491

PR: https://git.openjdk.org/jdk/pull/23491