Remove `pims` / `av` in favor of a video loading lib that works well across platforms about zamba HOT 3 CLOSED

Not directly documentation related but may be relevant:

looks like pims package used does not work with the recent av 0.4 and requires version 0.3.3

it may be worth to consider removing dependency on pims and to use av directly (or if desired another library for decoding video files), the pims usage is currently very limited.

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Updated title to reflect changing these libraries.

If we can use a library that is consistently installable with pip then we can remove the Anaconda requirement as well, which would be a nice plus.

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Using sk-video instead of pims and PyAV almost works as a one-line change, but not quite:

• 👍 The sk lib still allows indexing into the time dimension
• 👎 sk loads video as a numpy.ndarray whereas pims loads a pims.pyav_reader.PyAVReaderTimed. Array contents are the same (unit8) but the PyAV object can be put in a with block whereas the numpy array lacks the required __enter__() and __exit()__ methods.

So it seems like the fastest the fix is to either load the full array every time or provide the methods.

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