Add SeismicWriter and Xarray Support

[trhallam]

The package had no native SeismicWriter and would benefit from Xarray support.

I have added Lazy Xarray support for opening and writing ZGY files from SEGYSAK. I think it is better placed in this library.

Breaking Changes:
Requires Numpy>1.20

Code Changes:

• Fix numpy.bool depreciation error in openzgy. Fixes np.bool depreceated #5
• Refactor cdp calculations in SeismicLoader for easier reuse.
• Changed test suite to use fixtures for some common files.
• Updated setup.py to pyproject.toml.
• Use README.md as long description for PyPi
• Add Xarray to requirements

Features Added

• SeismicWriter class for basic full/sub-volume writing of ZGY. This is a simple wrapper on OpenZGY.api.ZgyWriter but mimics SeismicLoader. The class also helps with managing the context when doing multiple sub-volume writes. Fixes extend to include Write capability #3
• Added Xarray Backend Array, and EntryPoint for lazy loading of ZGY into an xarray.Dataset object.
• Added PyZGY accessor to enable write to ZGY with ds.pyzgy.to_zgy(...).
• Added Xarray details and SeismicWriter examples to README

Issues:

• Some ZGY functionality (smaller dtypes, units, and scalars are ommited for the time being).
• Compression isn't current supported as an argument for ZGY output but could be added.

[da-wad]

Great to have some improvements coming into this library - thanks @trhallam !

I have run the tests and get the following errors:

MacOS 3.8
Version 3.8 was not found in the local cache Error: Version 3.8 with arch arm64 not found
(I guess this is won't fix)

Python <=3.9
ERROR tests/test_read.py - TypeError: unsupported operand type(s) for |: 'type' and 'ABCMeta' ERROR tests/test_segyio-emulator.py - TypeError: unsupported operand type(s) for |: 'type' and 'ABCMeta

All others
FAILED tests/test_xarray.py::test_preferred_chunks[32bit] - ValueError: unrecognized chunk manager dask - must be one of: [] FAILED tests/test_xarray.py::test_xarray_corners[32bit] - ValueError: unrecognized chunk manager dask - must be one of: [] FAILED tests/test_xarray.py::test_xarray_to_zgy[32bit] - ValueError: unrecognized chunk manager dask - must be one of: [] FAILED tests/test_xarray.py::test_preferred_chunks[16bit] - ValueError: unrecognized chunk manager dask - must be one of: [] FAILED tests/test_xarray.py::test_xarray_corners[16bit] - ValueError: unrecognized chunk manager dask - must be one of: [] FAILED tests/test_xarray.py::test_xarray_to_zgy[16bit] - ValueError: unrecognized chunk manager dask - must be one of: [] FAILED tests/test_xarray.py::test_preferred_chunks[8bit] - ValueError: unrecognized chunk manager dask - must be one of: [] FAILED tests/test_xarray.py::test_xarray_corners[8bit] - ValueError: unrecognized chunk manager dask - must be one of: [] FAILED tests/test_xarray.py::test_xarray_to_zgy[8bit] - ValueError: unrecognized chunk manager dask - must be one of: [] FAILED tests/test_xarray.py::test_xarray_to_zgy_chunking[dims0-sm] - ValueError: unrecognized chunk manager dask - must be one of: [] FAILED tests/test_xarray.py::test_xarray_to_zgy_chunking[dims1-med] - ValueError: unrecognized chunk manager dask - must be one of: [] FAILED tests/test_xarray.py::test_xarray_to_zgy_chunking[dims2-lrg] - ValueError: unrecognized chunk manager dask - must be one of: []

These will need addressing before the PR can be accepted.

[trhallam]

Thanks @da-wad , Python 3.8 is basically at EOL from Q3 this year. Do you think it can be dropped from testing? Also Github runners don't have Python images on Arm64 for Python<=3.10.

[da-wad]

Quite happy for dropping Python 3.8 support for the new version.

Download stats indicate that since MacOS is not a priority, Arm64 can likely also be dropped pre Python 3.10:

[trhallam]

This should be all ready to go now @da-wad