* Make `@IntegrationConverter` Native compatible
* Add `BASE_PACKAGE` into an `IntegrationContextUtils`;
deprecate similar in the `IntegrationConfigUtils`.
This fixes a package tangle between `config` and `context`
* Move `ConverterRegistrar` and `CustomConversionServiceFactoryBean`
into a `config` package since they are package protected and
created their instances in the `IntegrationConverterInitializer`
functional way instead of reflection
* Use new `IntegrationContextUtils.BASE_PACKAGE` constant instead of
deprecated one
* Make `DefaultConfiguringBeanFactoryPostProcessor` `public` to
make it available for Spring Native `trigger` option in the `@NativeHint`
declaration
* Simplify logic around `JsonPath` to just a `ClassUtils.isPresent()`
* Move the `@IntegrationConverter` processing logic into the `ConverterRegistrar`
to avoid reflection via `BeanDefinition` ctor arg manipulation
* Move the reflection logic into a `ConverterParser` which, being a part of XML
configuration, is not going to be compatible with native any way
* Mark `JsonNodeWrapperToJsonNodeConverter` with an `@IntegrationConverter`
since it is not registered via reflection any more
* Expose `MicrometerMetricsCaptorRegistrar.METER_REGISTRY_PRESENT` and use
it in the `IntegrationGraphServer`
* Extract `UnmarshallingTransformer.MIME_MESSAGE_PRESENT` for less
reflection at runtime
* Use `null` for a `ClassLoader` arg in the `ClassUtils.isPresent()`
relying on the default one internally
* * Fix Checkstyle violations
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