add new data structure called Times

[eitanschreiber123]

add a new data structure called
times(times, callback, seed = 1) that calls callback with seed passed as the argument and passes the result to callback the times number of times and returns a Seq.Indexed of the results
For the type-definitions i wrote for flow but i still have to figure out for typescript for defining function types i tried Function, and ((_: any) => any) but both returned errors and the only other option is to use interfaces or the type keyword

[conartist6]

See my comments on #1695. I think this idea makes more sense, but personally I'd still be inclined not to do it. It's just more difficult to read than Range().map(_ => ...).