[FEATURE]: to_netcdf and additional keyword arguments

Is your feature request related to a problem?

I briefly tried to see if any issue was brought up but couldn't.

I'm hoping to be able to pass additional keyword arguments to the engine when using to_netcdf. https://xarray.pydata.org/en/stable/generated/xarray.open_dataset.html

However, it doesn't seem to easy to do so.

Similar to how open_dataset has an additional **kwargs parameter, would it be reasonable to add a similar parameter, maybe engine_kwargs to the to_netcdf to allow users to pass additional parameters to the engine?

Describe the solution you'd like

import xarray as xr
import numpy as np

dataset = xr.DataArray(
    data=np.zeros(3),
    name="hello"
).to_dataset()

dataset.to_netcdf("my_file.nc", engine="h5netcdf", engine_kwargs={"decode_vlen_strings=True"})

Describe alternatives you've considered

One could forward the additional keyword arguments with **kwargs. I just feel like this makes things less "explicit".

Additional context

h5netcdf emits a warning that is hard to disable without passing a keyword argument to the constructor.
https://github.com/h5netcdf/h5netcdf/issues/132

Also, for performance reasons, it might be very good to tune things like the storage data alignment.

Start by comparing the existing to_netcdf API with open_dataset, especially how each handles engine arguments. Check how the h5netcdf engine receives constructor options and determine the intended keyword-argument shape; done means to_netcdf can forward engine-specific options without breaking existing calls and the behavior is covered by tests.