Expose "memory" argument to the "netcdf4" engine

Is your feature request related to a problem?

As of today, xarray can't open a netcdf residing in a memory buffer, which is possible in netCDF4 library through the memory argument of the netCDF4.Dataset class constructor.

Describe the solution you'd like

It would be nice to create an xarray.Dataset from a netcdf file in memory like so:

buf: bytes = ...
ds = xr.open_dataset("dummy.nc", engine="netcdf4", memory=buf)

But this fails with

File ~/.asdf/installs/python/3.9.13/lib/python3.9/site-packages/xarray/backends/api.py:531, in open_dataset(filename_or_obj, engine, chunks, cache, decode_cf, mask_and_scale, decode_times, decode_timedelta, use_cftime, concat_characters, decode_coords, drop_variables, inline_array, backend_kwargs, **kwargs)
    519 decoders = _resolve_decoders_kwargs(
    520     decode_cf,
    521     open_backend_dataset_parameters=backend.open_dataset_parameters,
   (...)
    527     decode_coords=decode_coords,
    528 )
    530 overwrite_encoded_chunks = kwargs.pop("overwrite_encoded_chunks", None)
--> 531 backend_ds = backend.open_dataset(
    532     filename_or_obj,
    533     drop_variables=drop_variables,
    534     **decoders,
    535     **kwargs,
    536 )
    537 ds = _dataset_from_backend_dataset(
    538     backend_ds,
    539     filename_or_obj,
   (...)
    547     **kwargs,
    548 )
    549 return ds

TypeError: open_dataset() got an unexpected keyword argument 'memory'

Describe alternatives you've considered

An alternative is to save the buffer into a temporary file and open it the usual way, but it feels cumbersome when there is already an argument to open directly from memory.

Additional context

No response

Start at xarray.open_dataset and trace how the netcdf4 engine forwards arguments to netCDF4.Dataset. Reproduce the reported TypeError with an in-memory bytes buffer, then verify that the example using engine="netcdf4" and memory=buf opens the dataset successfully. Add or update coverage for this behavior if the relevant test location is identified.