expose _to_temp_dataset / _from_temp_dataset as semi-public API?

When writing accessors which behave the same for both Dataset and DataArray, it would be incredibly useful to be able to use DataArray._to_temp_dataset / DataArray._from_temp_dataset to deduplicate code. Is it safe to use those in external packages (like pint-xarray)?

Otherwise I guess it would be possible to use

name = da.name if da.name is None else "__temp"
temp_ds = da.to_dataset(name=name)
new_da = temp_ds[name]
if da.name is None:
    new_da = new_da.rename(da.name)
assert_identical(da, new_da)

but that seems less efficient.

Start by locating DataArray._to_temp_dataset and DataArray._from_temp_dataset and reviewing their existing tests and API conventions. Compare their behavior with the to_dataset example in the issue and inspect how pint-xarray would use them. Done means a clear decision about external use, with the corresponding API documentation and tests if changes are required.