add RDAnalysisExternals/integration rd analysis

cmake/CEPCSWDependencies.cmake

@@ -18,6 +18,7 @@ Find all the dependencies here, so in each package user don't need to find the p
 - podio
 - ROOT
 - CKF
+- RDAnalysis
 #]]
 
 ##############################################################################
@@ -65,3 +66,12 @@ else()
 endif()
 
 find_package(FastJet)
+
+
+if (CEPCSW_USE_SYSTEM_RDANALYSIS)
+  message("Try to use an existing installation of RDAnalysis")
+  find_package(RDAnalysis)
+else()
+  message("Try to use an internal installation of RDAnalysis")
+  include("${CMAKE_CURRENT_LIST_DIR}/internal_rdana.cmake")
+endif()

cmake/internal_rdana.cmake

+include(FetchContent)
+
+FetchContent_Declare(
+  RDAnalysis
+  GIT_REPOSITORY https://code.ihep.ac.cn/cepc/externals/RDAnalysis.git
+  GIT_TAG  4c24156a9ccec59c2d728ff9e1824743f1819850
+  )
+
+FetchContent_MakeAvailable(RDAnalysis)
+