Support custom NiFi components via git-sync (#793)

* Support custom Python processors via git-sync

* Upgrade stackable-operator

* Add logging support to git-sync containers

* Regenerate charts

* Upgrade stackable-operator

* test: Reimplement the ShoutProcessor in Java

* test: Use the Java processor in the NiFi flow

* Rename "custom processors" to "custom components"

* Use fully qualified types for external error sources

* test: Recompile the Java processor with Java 11

* test: Test customComponentsGitSync also for NiFi 1.x

* Add comment

* docs: Document loading of custom components via git-sync

* docs: Document all options of loading custom components

* Configure Python regardless of git-sync

* Format Rust code

* Re-format Rust code

* Upgrade stackable-operator

* Improve the documentation

* Fix documentation URL

* Fix documentation URL

* test: Use fixed Git commits for the custom processors

* Regenerate charts

* test: Fix the logging test

Author: siegfriedweber

CHANGELOG.md

@@ -13,6 +13,7 @@ All notable changes to this project will be documented in this file.
   - Use `--console-log-format` (or `CONSOLE_LOG_FORMAT`) to set the format to `plain` (default) or `json`.
 - NiFi 2.x now supports storing cluster state in Kubernetes instead of ZooKeeper ([#775]).
 - Add test for Apache Iceberg integration ([#785]).
+- Add support for custom components via git-sync ([#793]).
 
 ### Changed
 
@@ -50,6 +51,7 @@ All notable changes to this project will be documented in this file.
 [#785]: https://github.com/stackabletech/nifi-operator/pull/785
 [#787]: https://github.com/stackabletech/nifi-operator/pull/787
 [#789]: https://github.com/stackabletech/nifi-operator/pull/789
+[#793]: https://github.com/stackabletech/nifi-operator/pull/793
 [#799]: https://github.com/stackabletech/nifi-operator/pull/799
 [#801]: https://github.com/stackabletech/nifi-operator/pull/801