Cfgrib

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- Fixed compatibility with xarray 2024.09.0
See `401 <https://github.com/ecmwf/cfgrib/pull/401>`_.

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- Added `coords_as_attributes` argument to `open_dataset()` to allow selected dimensions
to be stored as attributes rather than dimensions, allowing more heterogeneous data
to be encoded as an xarray dataset.
See `394 <https://github.com/ecmwf/cfgrib/pull/394>`_.

- Added valid_month dimension if monthlyVerificationDate and validityTime are available.
See `393 <https://github.com/ecmwf/cfgrib/pull/393>`_.

- Added uvRelativeToGrid to list of GRIB keys read by default.
See `379 <https://github.com/ecmwf/cfgrib/pull/379>`_.

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- Allow users to pass of list of values to filter a key by.
See `384 <https://github.com/ecmwf/cfgrib/pull/384>`_.

- Functionality to ignore keys when reading a grib file
See `382 <https://github.com/ecmwf/cfgrib/pull/382>`_.

- Preserve coordinate encoding in cfgrib.open_datasets
See `381 <https://github.com/ecmwf/cfgrib/pull/381>`_.

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- fixed issue where GRIB messages with non-hourly steps could not be read
See `370 <https://github.com/ecmwf/cfgrib/pull/370>`_.

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- added automatic caching of geographic coordinates for improved performance
See `341 <https://github.com/ecmwf/cfgrib/pull/341>`_.

- fixed issue where to_grib() could crash if given a dataset with a single-valued dimension
See `347 <https://github.com/ecmwf/cfgrib/issues/347>`_.

- fixed issue where values could not be extracted when alternativeRowScanning=1 and
grid is not represented as 2D
See `358 <https://github.com/ecmwf/cfgrib/issues/358>`_.

- fixed issue where the `grib_errors` parameter was not being handled correctly.
This parameter has now been renamed to `errors`.
See `349 <https://github.com/ecmwf/cfgrib/issues/349>`_.

- dropped support for Python 3.6.
See `363 <https://github.com/ecmwf/cfgrib/issues/363>`_.

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- added --var-encoding-json (or -v) option to the to_netcdf tool, e.g.
``cfgrib to_netcdf -v '{"dtype": "float", "scale_factor": 0.1}' -o $OUTFILE $INFILE``
See `334 <https://github.com/ecmwf/cfgrib/pull/334>`_.
- fix issue where xarrays derived from Gaussian grids did not have the correct
geometry when written back out as GRIB
See `330 <https://github.com/ecmwf/cfgrib/issues/330>`_.
- fix issue where open_datasets() could merge different GRIB fields
that have the same data values
See `336 <https://github.com/ecmwf/cfgrib/issues/336>`_.