Owen Littlejohns

Migrate datatree.py module into xarray.core.

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This PR migrates the `datatree.py` module to `xarray/core/datatree.py`, as part of the on-going effort to merge `xarray-datatree` into `xarray` itself. Most of the changes are import path changes, and type-hints,...

This PR migrates what I believe is the last actual source code out of the `xarray/datatree_/datatree` directory into `xarray/core`. This is another piece of #8572. I made a couple of...

DAS-2155 - Merge datatree documentation into main docs.

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This PR migrates documentation for datatree from `xarray/datatree_/docs` into the main `doc` directory. It seems a little iffy that a bunch of the references to the `DataTree` class, associated methods...

Cloud Optimized Examples refer to tools and services pending deprecation

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The PO.DAAC Cookbook has [a section on Cloud Optimized Examples](https://podaac.github.io/tutorials/quarto_text/CloudOptimizedExamples.html). These examples show the usage of [zarr-eosdis-store](https://github.com/nasa/zarr-eosdis-store) and the [Harmony NetCDF-to-Zarr conversion service](https://github.com/nasa/harmony-netcdf-to-zarr). zarr-eosdis-store has functional overlap with [VirtualiZarr](https://virtualizarr.readthedocs.io/en/latest/), and...