tests - converter - introduce string() cast check and make it charset independent
tests - converter - introduce string() cast check and make it charset independent

Should now work on both UTF-8 and Latin1 system charsets

agwe/jolie,agwe/jolie,jolie-projects/jolie-async,innopolis-jolie-smt-typechecker/jolie,mawolf/jolie,agwe/jolie,mawolf/jolie,jolie-projects/jolie-async,jolie-projects/jolie-async,innopolis-jolie-smt-typechecker/jolie,innopolis-jolie-smt-typechecker/jolie,mawolf/jolie,agwe/jolie,innopolis-jolie-smt-typechecker/jolie,jolie-projects/jolie-async,mawolf/jolie