Fix: Shorten shm_list key for osx #341
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More or less a verbatim copy-paste minus some edgy variable naming and internal `piker` module imports. There is a bunch of OHLC related defaults that need to be dropped and we need to adjust to an optional dependence on `numpy` by supporting shared lists as per the mp docs.
First attempt at getting `multiprocessing.shared_memory.ShareableList` working; we wrap the stdlib type with a readonly attr and a `.key` for cross-actor lookup. Also, rename all `numpy` specific routines to have a `ndarray` suffix in the func names.
Demonstrates fixed size frame-oriented reads by the child where the parent only transmits a "read" stream msg on "frame fill events" such that the child incrementally reads the shm list data (much like in a real-time-buffered streaming system).
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