Update Spring Integration metrics support since Spring Integration
`4.3.6`+ no longer needs `spring-integration-jmx` enable
`MessageChannel`, `MessageHandler` and `MessageSource` metrics.
- Add `IntegrationManagementConfiguration` conditional auto-configuration
to provide `@EnableIntegrationManagement` when JMX is `enabled` or there
is no `IntegrationManagementConfigurer.MANAGEMENT_CONFIGURER_NAME` bean.
By default this bean doesn't exist and you explicitly should declare it
(e.g. via `@EnableIntegrationManagement`) if you would like to collect
metrics. At the same time Spring Integration enables it when JMX
management is present (that is a purpose of that new
`IntegrationManagementConfiguration`)
- Change `SpringIntegrationMetricReader` to read metrics from the
`IntegrationManagementConfigurer`, not `IntegrationMBeanExporter`
- Change `PublicMetricsAutoConfiguration` to register
`IntegrationManagementConfigurer.MANAGEMENT_CONFIGURER_NAME` bean if
not present. Since we are here in `actuator`, therefore we are
interested in the metrics for SI as well.
- Since we don't need JMX for the metrics any more, remove SI-JMX
dependency from the `spring-boot-starter-integration`.
- Remove `IntegrationManagementConfiguration` modification from the
`integrationMbeanExporter()`, since that looks like mutation of an
external object, when end-user would prefer their own options.
Therefore we don't need `ObjectProvider<IntegrationManagementConfigurer>`, too
- Add missed `MessageSourceMetrics` gathering for the
`SpringIntegrationMetricReader`
Closes gh-7722