JIRA: https://jira.spring.io/browse/INT-3651
- Add documentation for the new JMX environment
- Add the ability to customize the default metrics implementations
- Fix LifecycleMessageHandlerMetrics to get a custom `MessageHandlerMetrics`
- Add an escape to the bean pattern matcher to handle beans starting with `!`
INT-3651: More Docs/Polishing
* JavaDocs polishing
* Change `jmx.xml` to describe `public void stopActiveComponents(long howLong)` not that removed with `boolean force`
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