RFR: 8265754: Move suspend/resume API from HandshakeState [v4]

[Anton Artemov]

> Hi,
> 
> in this PR the suspend/resume methods are moved away from the HandshakeState class into a new separate class HandshakeSuspender. The idea is that the state class should be a state keeper and should not be responsible for actions which change the state. Such actions should be done by a separate class. 
> 
> Tested in tiers 1-4.

Anton Artemov has updated the pull request incrementally with six additional commits since the last revision:

 - 8265754: Refactoring.
 - 8265754: Refactoring.
 - 8265754: Refactoring.
 - 8265754: Refactoring.
 - 8265754: Refactoring.
 - 8265754: Refactoring

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/25407/files
  - new: https://git.openjdk.org/jdk/pull/25407/files/3b0fffab..2f6a26d4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25407&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25407&range=02-03

  Stats: 113 lines in 5 files changed: 20 ins; 34 del; 59 mod
  Patch: https://git.openjdk.org/jdk/pull/25407.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25407/head:pull/25407

PR: https://git.openjdk.org/jdk/pull/25407