Xcube-cci

* Fixed support for SST climatology dataset

* Support Climatology Datasets
* Ensure compatiblity with Python versions > 3.10. This concerns the way
new event loops are created within threads. A deprecated event loop
policy has been removed.
Solves issues [61](https://github.com/dcs4cop/xcube-cci/issues/61)
and [64](https://github.com/dcs4cop/xcube-cci/issues/64)

* Removed cache
* Pinned pydap version
* Improved determination of CCI data chunks

* Consider environment parameter `READ_CEDA_CATALOGUE` to trigger whether
metadata from the ceda catalogue shall be read. Enabled by default.
* Updated list of supported datasets.
No odp-provided datasets are excluded anymore.

* Zarr Datastore reads data ids from json file if provided
* Updated CCI Store to set zarr store (from here on, xcube 0.12.1 is required)
[62](https://github.com/dcs4cop/xcube-cci/issues/62)

* Updated Example Notebooks
* Extended support of datasets. Previously, datasets which had a chunking of
the time dimension larger than one were not handled properly. This affected
OZONE in a monthly resolution, SEALEVEL in a monthly resolution, and several
ICESHEETS datasets. [12](https://github.com/dcs4cop/xcube-cci/issues/12)
* Chunk sizes may now also be decreased, in order to achieve optimal chunkings.
For some datasets (e.g., BIOMASS), this increases the performance and helps
avoiding memory issues. [48](https://github.com/dcs4cop/xcube-cci/issues/48)