Merge remote-tracking branch 'apache/2374-provide-a-framework-to-easi…

…ly-unit-test-processing-elements' into 2374-provide-a-framework-to-easily-unit-test-processing-elements

# Conflicts:
#	streampipes-extensions/streampipes-processors-filters-jvm/src/test/java/org/apache/streampipes/processors/filters/jvm/processor/booleanfilter/TestBooleanFilterProcessor.java
#	streampipes-extensions/streampipes-processors-filters-jvm/src/test/java/org/apache/streampipes/processors/filters/jvm/processor/compose/TestComposeProcessor.java
#	streampipes-extensions/streampipes-processors-filters-jvm/src/test/java/org/apache/streampipes/processors/filters/jvm/processor/merge/TestMergeByTimeProcessor.java
#	streampipes-extensions/streampipes-processors-filters-jvm/src/test/java/org/apache/streampipes/processors/filters/jvm/processor/numericalfilter/NumericalFilterProcessorTest.java
#	streampipes-extensions/streampipes-processors-filters-jvm/src/test/java/org/apache/streampipes/processors/filters/jvm/processor/sdt/TestSwingingDoorTrendingFilterProcessor.java
#	streampipes-extensions/streampipes-processors-filters-jvm/src/test/java/org/apache/streampipes/processors/filters/jvm/processor/textfilter/TestTextFilterProcessor.java
#	streampipes-test-utils-executors/src/test/java/org/apache/streampipes/test/executors/ProcessingElementTestExecutor.java