Import source to librtti

Summary:

- Import initial source

Test Plan:
NA

testsuite/meson.build

@@ -0,0 +1,13 @@
+librtti_test_srcs = [
+  'test.c',
+  'test_iter.c',
+]
+
+unity_dep = dependency('unity')
+librtti_test_deps = [dep_librtti, unity_dep]
+
+librtti_test = executable('rtti_test',
+                          librtti_test_srcs,
+                          include_directories: [incdir],
+                          dependencies: librtti_test_deps,
+                          install: true)