BLE HF2 log service (#1549)

* basic hf2 service

* service to send hf2 log messages

* use common console.log

* updated shims

* adding config

* adding simulator

* fix hf2 logging

* hide console blocks

libs/core/codal.cpp

@@ -228,8 +228,9 @@ void debuglog(const char *format, ...)
     va_end(arg);
 }
 
-
-
+void sendSerial(const char *data, int len) {
+    logwriten(data, len);
+}
 
 } // namespace pxt