Add numcodecs namespace and built-in shuffle/delta codecs#385
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V2 filters and compressors are now looked up under a `numcodecs.` prefix in the codec registry, matching zarr-python's naming convention. This separates the v2-specific codec namespace from v3 codecs and makes it clear where these codecs come from. Existing codecs that serve both v2 and v3 (blosc, zstd, gzip, zlib, etc.) are registered under both names so nothing breaks. Adds `numcodecs.shuffle` and `numcodecs.delta` as built-in codecs since these are commonly requested v2 filters (#311, #315) and are trivial pure-JS implementations.
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V2 filters and compressors are now looked up under a
numcodecs.prefix in the codec registry, matching zarr-python's naming convention. This separates the v2-specific codec namespace from v3 codecs and makes it clear where these codecs come from.Existing codecs that serve both v2 and v3 (blosc, zstd, gzip, zlib, etc.) are registered under both names so nothing breaks. Adds
numcodecs.shuffleandnumcodecs.deltaas built-in codecs since these are commonly requested v2 filters (#311, #315) and are trivial pure-JS implementations.