ENH: Enable minute bar data with TALib transform.

Add a `bars` keyword arg, as is used with BatchTransform.

Also, instead of overwriting the window_length kwarg with timeperiod,
always use the lookback value from the created TALib function,
as timeperiod will be an input into that value if it exists.

Calculate `window_length` in minute mode so that there are enough
days to cover the minutes in the timeperiod.