ANN: MaxMinFilters.jl - fast streaming maximum / minimum within moving window

[tkf]

@sairus7

Also, I think there should be added stateful filters for all windowed functions, so it can be used for streaming processing when new data are available in chunks.

Just FYI, you may be interested in transducers instead of stateful functions, e.g., if you want to squeeze out performance. See: GitHub - JuliaFolds/Transducers.jl: Efficient transducers for Julia / Clojure - Transducers