Adds dunder methods to ShardingCodec to enable pickling, and adds a simple test for this
refactors the codecs test suite. this is the start of a larger effort.
fixes a small bug in morton order calculation that broke sharding for 1D arrays, and adds a test for it
removes some tests from test_codecs that were not testing codecs, and were instead testing things that we are testing elsewhere. I suspect these tests were copied in from zarrita.
closes #1990
TODO:
[ ] Add unit tests and/or doctests in docstrings
[ ] Add docstrings and API docs for any new/modified user-facing classes and functions
[ ] New/modified features documented in docs/tutorial.rst
ShardingCodecto enable pickling, and adds a simple test for thistest_codecsthat were not testing codecs, and were instead testing things that we are testing elsewhere. I suspect these tests were copied in from zarrita.closes #1990
TODO: