Reintroduce C++ support and add usage tests for C++ (#4)

Reviewed-on: #4
Co-authored-by: Abdelrahman <said.abdelrahman89@gmail.com>
Co-committed-by: Abdelrahman <said.abdelrahman89@gmail.com>

codegen/array/snippets/stack_array_cpp

@@ -0,0 +1,9 @@
+([&]() {{ \
+  persistent {T} buf[wapp_misc_utils_u64_round_up_pow2(wapp_misc_utils_va_args_count({T}, __VA_ARGS__) * 2)] = {{__VA_ARGS__}}; \
+  return {ArrayType}{{ \
+    buf, \
+    wapp_misc_utils_va_args_count({T}, __VA_ARGS__), \
+    wapp_misc_utils_u64_round_up_pow2(wapp_misc_utils_va_args_count({T}, __VA_ARGS__) * 2), \
+    sizeof({T}) \
+  }}; \
+}}())