The "function dictionary" that maps keys to a transformer function
ret - An object whose keys index the corresponding result of the transformer function
let fd = { 'a' : ()=>"hi" , 'b' : (e)=>e.toLowerCase }
let res = apply_function_dictionary_to_object(fd, "HELLO")
//returns { 'a' : "hi" , 'b' : "hello" }
Same as apply_function_dictionary_to_object however assumes asynchronous transformer functions. Takes an object whos keys are fields in a dictionary and values are functions and calls each function with a supplied argument and assings the result to the corresping key of the return object