Add Lua getUsage() function that returns percent of already used up i… (#5313)

* Add Lua getUsage() function that returns percent of already used up instructions in current script execution cycle. It can be used to avoid script being killed when doing long lasting tasks (like telemetry logs loading and parsing)

* Compilation fixes

* Doc fix

* Disable Lua script instructions limit in DEBUG mode

radio/src/lua/lua_api.h

@@ -151,6 +151,7 @@ extern struct our_longjmp * global_lj;
 
 extern uint16_t maxLuaInterval;
 extern uint16_t maxLuaDuration;
+extern uint8_t instructionsPercent;
 
 #if defined(PCBTARANIS)
   #define IS_MASKABLE(key) ((key) != KEY_EXIT && (key) != KEY_ENTER && ((luaState & INTERPRETER_RUNNING_STANDALONE_SCRIPT) || (key) != KEY_PAGE))