Prior to this commit, each app documented its available config props
in its README.adoc. Now that the functions have been moved to the
function catalog, these inline docs are replaced w/ a link to the
respective function catalog docs.
See #524
Add `JsonBytesToMap` function to allow conversion between byte[] and JSON Map.
Fixes https://github.com/spring-cloud/stream-applications/issues/441
* Introduce a `JsonBytesToMap` as a part of a `payload-converter-function` module
which is auto-discovered by Spring Cloud Function scanning algorithm - the `functions` package.
* Add a `payload-converter-function` as dependency into an `aggregator-function`
* Compose `jsonBytesToMap|aggregatorFunction` for the `aggregator-processor`
* Verify a `JsonBytesToMap` function in action with an `AggregatorProcessorTests`
* Mentioned such a payload conversion in the `aggregator-processor` README
* Have all the required dependencies in class path which give us a `MessageGroupStore` implementation
* Disable all their auto-configurations in the `ExcludeStoresAutoConfigurationEnvironmentPostProcessor`
* Enable only those which are configured by the `aggregator.messageStoreType` property
* Implement a fully reactive function around an aggregator making an interaction via a pair of `FluxMessageChannel`
* Fix checkstyle issues
* Change the app generator maven plugin to new coordinates
