* GH-3376: Remove gauges on application ctx close
Fixes https://github.com/spring-projects/spring-integration/issues/3376
The `MeterRegistry` may request meters on application shutdown.
The gauges for channels, handlers and message sources don't make sense
at the moment since all those beans are going to be destroyed.
* Remove gauges for channel, handler and message source numbers from the
`IntegrationManagementConfigurer.destroy()`
**Cherry-pick to 5.3.x & 5.2.x**
* * Add `MicrometerImportSelector` to conditionally load
a `MicrometerMetricsCaptorConfiguration` when `MeterRegistry`
is on class path.
* Make `MicrometerMetricsCaptorConfiguration.integrationMicrometerMetricsCaptor()`
bean dependant on the `ObjectProvider<MeterRegistry>`
* Make `IntegrationManagementConfiguration.managementConfigurer()`
dependant on the `ObjectProvider<MetricsCaptor>`.
This way the `IntegrationManagementConfigurer` is destroyed before
`MeterRegistry` when application context is closed
* Deprecate `MicrometerMetricsCaptor.loadCaptor()` in favor of
`@Import(MicrometerImportSelector.class)`
* * Add `MicrometerMetricsCaptorRegistrar` to register a `MICROMETER_CAPTOR_NAME`
bean when `MeterRegistry` is on class path and no `MICROMETER_CAPTOR_NAME` bean yet.
* Make `IntegrationManagementConfiguration.managementConfigurer()`
dependant on the `ObjectProvider<MetricsCaptor>`.
This way the `IntegrationManagementConfigurer` is destroyed before
`MeterRegistry` when application context is closed
* Deprecate `MicrometerMetricsCaptor.loadCaptor()` in favor of
`@Import(MicrometerMetricsCaptorRegistrar.class)`
* Fix test to make a `MeterRegistry` bean as `static` since
`@EnableIntegrationManagement` depends on this bean definition now
# Conflicts:
# spring-integration-core/src/main/java/org/springframework/integration/config/EnableIntegrationManagement.java
# spring-integration-core/src/main/java/org/springframework/integration/config/IntegrationManagementConfiguration.java
# spring-integration-core/src/main/java/org/springframework/integration/config/IntegrationManagementConfigurer.java
* Fix some deprecation warnings
d0cab670eb