refactor: Rename PIDFeatureExtractor.cxx to pidFeatureExtractor.cxx and update CMakeLists.txt for ALICE O2 naming conventions

Author: forynski

Tools/PIDFeatureExtractor/CMakeLists.txt

@@ -10,6 +10,6 @@
 # or submit itself to any jurisdiction.
 
 o2physics_add_dpl_workflow(pid-feature-extractor
-                           SOURCES PIDFeatureExtractor.cxx
+                           SOURCES pidFeatureExtractor.cxx
                            PUBLIC_LINK_LIBRARIES O2Physics::AnalysisCore
                            COMPONENT_NAME Analysis)

Tools/PIDFeatureExtractor/PIDFeatureExtractor.cxx

@@ -9,7 +9,7 @@
 // granted to it by virtue of its status as an Intergovernmental Organization
 // or submit itself to any jurisdiction.
 
-/// \file PIDFeatureExtractor.cxx
+/// \file pidFeatureExtractor.cxx
 /// \brief Task to extract particle identification features from ALICE AO2D data for machine learning workflows
 /// \author Robert Forynski