Add basic tracing lib files

tracetools/src/.gitignore

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+# generated files (LTTng)
+tp_call.c
+tp_call.h

tracetools/src/status.c

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+#include <stdio.h>
+#include "tracetools/tracetools.h"
+
+int main()
+{
+  printf("Tracing ");
+  if (ros_trace_compile_status()) {
+    printf("enabled\n");
+    return 0;
+  } else {
+    printf("disabled\n");
+    return 1;
+  }
+}

tracetools/src/tracetools.c

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+#include "tracetools/tracetools.h"
+
+#ifdef WITH_LTTNG
+#include "tp_call.h"
+#endif
+
+
+bool ros_trace_compile_status() {
+#ifdef WITH_LTTNG
+    return true;
+#else
+    return false;
+#endif
+}
+
+void ros_trace_rcl_init() {
+#ifdef WITH_LTTNG
+    tracepoint(ros2, rcl_init);
+#endif
+}