WIP use catch2 instead of unity

lib/catch2/CMakeLists.txt

@@ -0,0 +1 @@
+idf_component_register(SRCS "catch_runner.cpp" INCLUDE_DIRS "include")

lib/catch2/catch_runner.cpp

@@ -0,0 +1,10 @@
+#include "catch_runner.hpp"
+
+#define CATCH_CONFIG_RUNNER
+#include "catch2/catch.hpp"
+
+void run_catch(void) {
+  int argc = 1;
+  char *argv = "catch2";
+    Catch::Session().run( argc, &argv );
+}

lib/catch2/include/catch_runner.hpp

@@ -0,0 +1,3 @@
+#pragma once
+
+void run_catch(void);