chore: Rearrange central CMake, plugins vs examples (#2280)

Separating plugins and examples into their sections

CMakeLists.txt

@@ -270,15 +270,8 @@ endmacro()
 # find packages explicitly for each component even if this means searching for
 # the same package twice. This avoids having complex if/else trees to sort out
 # when a particular package is actually needed.
+
 # plugin dependencies
-if(ACTS_BUILD_EXAMPLES_PYTHON_BINDINGS)
-  find_package(Python 3.8 REQUIRED COMPONENTS Interpreter Development)
-  if(ACTS_USE_SYSTEM_PYBIND11) 
-    find_package(pybind11 CONFIG REQUIRED)
-  else()
-    add_subdirectory(thirdparty/pybind11)
-  endif()
-endif()
 if(ACTS_BUILD_PLUGIN_ACTSVG)
   if(ACTS_USE_SYSTEM_ACTSVG)
     message(STATUS "Using system installation of actsvg")
@@ -345,10 +338,16 @@ if(ACTS_BUILD_PLUGIN_EXATRKX)
     find_package(TorchScatter REQUIRED)
   endif()
 endif()
-
 if(ACTS_BUILD_PLUGIN_ONNX OR ACTS_EXATRKX_ENABLE_ONNX)
   find_package(OnnxRuntime ${_acts_onnxruntime_version} REQUIRED)
 endif()
+if(ACTS_BUILD_PLUGIN_EDM4HEP)
+  find_package(podio ${_acts_podio_version} REQUIRED CONFIG)
+  find_package(EDM4HEP ${_acts_edm4hep_version} REQUIRED CONFIG)
+endif()
+if(ACTS_BUILD_PLUGIN_GEANT4)
+  find_package(Geant4 REQUIRED CONFIG COMPONENTS gdml)
+endif()
 
 # examples dependencies
 if(ACTS_BUILD_EXAMPLES)
@@ -359,18 +358,19 @@ if(ACTS_BUILD_EXAMPLES)
   check_root_compatibility()
   add_subdirectory(thirdparty/dfelibs)
 endif()
+if(ACTS_BUILD_EXAMPLES_PYTHON_BINDINGS)
+  find_package(Python 3.8 REQUIRED COMPONENTS Interpreter Development)
+  if(ACTS_USE_SYSTEM_PYBIND11) 
+    find_package(pybind11 CONFIG REQUIRED)
+  else()
+    add_subdirectory(thirdparty/pybind11)
+  endif()
+endif()
 if(ACTS_BUILD_EXAMPLES_DD4HEP AND ACTS_BUILD_EXAMPLES_GEANT4)
   find_package(DD4hep ${_acts_dd4hep_version} REQUIRED CONFIG COMPONENTS DDCore DDG4 DDDetectors)
 elseif(ACTS_BUILD_EXAMPLES_DD4HEP)
   find_package(DD4hep ${_acts_dd4hep_version} REQUIRED CONFIG COMPONENTS DDCore DDDetectors)
 endif()
-if(ACTS_BUILD_PLUGIN_EDM4HEP)
-  find_package(podio ${_acts_podio_version} REQUIRED CONFIG)
-  find_package(EDM4HEP ${_acts_edm4hep_version} REQUIRED CONFIG)
-endif()
-if(ACTS_BUILD_PLUGIN_GEANT4)
-  find_package(Geant4 REQUIRED CONFIG COMPONENTS gdml)
-endif()
 if(ACTS_BUILD_EXAMPLES_HEPMC3)
   find_package(HepMC3 ${_acts_hepmc3_version} REQUIRED CONFIG)
 endif()