[Feature][UDF] support LUA UDF

[stdpain]

1. create a lua function

-- create udf function int (int,int)
CREATE FUNCTION lua_add(int,int) 
RETURNS int 
properties 
(
 "type"="LUA",
 "symbol" = "LUA_ADD",
 "object_file" = "http://127.0.0.1:8097/ans.lua"
);

-- create udf function string (string,string)
CREATE FUNCTION lua_cat(varchar(50),varchar(50)) 
RETURNS varchar(50) 
properties 
(
 "type"="LUA",
 "symbol" = "LUA_STRCAT",
 "object_file" = "http://127.0.0.1:8097/ans2.lua"
);

ans.lua:

function LUA_ADD(a, b)
 return a+b;
end 
return 1

ans2.lua

function LUA_STRCAT(a,b)
 return string.format("%s %s",a,b);
end

[WencongLiu]

Hello @stdpain , recently I'd like to add Python UDF for doris. I have some ideas and questions. Could we have a talk on wechat? My wechat ID is Liuwenclever. Thank you very much.