[CI]Added initial framework of CXX unittest (#98)

Based on the discussion in #53 , I just added the initial flow of CXX unittests for this repo, with providing two dummy UTs as placeholder to show the usage, feel free to add your own CXX unittests. 
@Superjomn  @ptillet 

@ptillet , in this PR, I also configure the integration-tests.yml to add the unittest into github CI check. 

Thanks

unittest/Analysis/CMakeLists.txt

@@ -0,0 +1,5 @@
+add_triton_ut(
+  NAME TritonAnalysisTests
+  SRCS UtilityTest.cpp
+  LIBS TritonAnalysis
+)