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Add dim-expression support in Dataset.select  (#3920)

* Add compute and keep_index kwargs to interface.values. Adds new `compute` and `keep_index` kwargs to the `values` method of all data interfaces. For dask data structures, compute controls whether value is evaluated before being returned. For pandas/dask Series, keep_index controls whether the values are returned as a series (keep_index=True) or array (keep_index=False).

* Support indexing Dataset with pandas/Dask series. Makes it possible to filter a dataset using a pandas or dask series with index that matches the index of the element's `data` data frame.

* Add expression selection tests

* Add selection_expr argument to Dataset.select. This may be set to a dim predicate express indicating which rows should kept. Add error message if first arg is not a dim expression, referring users to the selection_specs keyword argument.

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