QC-1346 Scaffolding to share common code among QC data processors

Actor is a template base class for all QC Data Processors. It is supposed to bring their commonalities together,
such as: service initialization, Data Processing Layer adoption, retrieving configuration and runtime parameters,
interactions with controlling entities (DPL driver, AliECS, ODC).

The design is based on CRTP (see the web for explanation), which allows us to:
- avoid code repetition in implementing aforementioned commonalities
- optionally perform certain actions depending on traits of an Actor specialization.
CRTP, in contrast to dynamic inheritance, is also advertised to avoid performance impact due to vtable lookups.
It is certainly a nice bonus in our case, but it was not the main motivation for CRTP-based approach.

To allow for compile-time customization of centralized Actor features, we require each concrete Actor to implement
an ActorTraits structure with certain parameters which is enforced with ValidActorTraits concept.
The traits are separated from the main Actor class to improve readability and allow for shorter compilation times
by allowing many helper functions avoid including Actor.h and a corresponding actor specialization. For additional
savings on compilation time and clutter in code, we validate ActorTraits specializations with a concept only in
Actor, but this could be revisited if proven wrong.

This commit paves the path for refactoring existing QC data processors as Actor specializations/children.

Author: knopers8

Framework/CMakeLists.txt

@@ -140,6 +140,9 @@ add_library(O2QualityControl
   src/QCInputsAdapters.cxx
   src/QCInputsFactory.cxx
   src/UserInputOutput.cxx
+  src/Actor.cxx
+  src/ActorHelpers.cxx
+  src/DataProcessorAdapter.cxx
 )
 
 target_include_directories(
@@ -270,12 +273,16 @@ endforeach()
 add_executable(o2-qc-test-core
                test/testActivity.cxx
                test/testActivityHelpers.cxx
+               test/testActorHelpers.cxx
+               test/testActorTraits.cxx
+               test/testActor.cxx
                test/testAggregatorInterface.cxx
                test/testAggregatorRunner.cxx
                test/testCheck.cxx
                test/testCheckInterface.cxx
                test/testCheckRunner.cxx
                test/testCustomParameters.cxx
+               test/testDataProcessorAdapter.cxx
                test/testDataHeaderHelpers.cxx
                test/testInfrastructureGenerator.cxx
                test/testMonitorObject.cxx
@@ -295,6 +302,7 @@ add_executable(o2-qc-test-core
                test/testQualitiesToFlagCollectionConverter.cxx
                test/testQCInputs.cxx
                test/testUserInputOutput.cxx
+               test/testStringUtils.cxx
 )
 set_property(TARGET o2-qc-test-core
              PROPERTY RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/tests)
@@ -310,6 +318,7 @@ target_include_directories(o2-qc-test-core PRIVATE ${CMAKE_SOURCE_DIR})
 target_include_directories(o2-qc-test-core PRIVATE $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>)
 
 set(TEST_SRCS
+    test/testActorCallbacks.cxx
     test/testDbFactory.cxx
     test/testPublisher.cxx
     test/testQcInfoLogger.cxx
@@ -325,12 +334,12 @@ set(TEST_SRCS
     test/testWorkflow.cxx
     test/testRepoPathUtils.cxx
     test/testUserCodeInterface.cxx
-    test/testStringUtils.cxx
     test/testRunnerUtils.cxx
     test/testBookkeepingQualitySink.cxx
   )
 
 set(TEST_ARGS
+    "-b --run"
     ""
     ""
     ""
@@ -380,6 +389,8 @@ endforeach()
 
 target_include_directories(testCcdbDatabase PRIVATE $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>)
 
+set_property(TEST testActorCallbacks PROPERTY TIMEOUT 30)
+set_property(TEST testActorCallbacks PROPERTY LABELS slow)
 set_property(TEST testWorkflow PROPERTY TIMEOUT 40)
 set_property(TEST testWorkflow PROPERTY LABELS slow)
 set_property(TEST testCheckWorkflow PROPERTY TIMEOUT 50)