Add GRLC query that restricts cell type by subset as well as location

(first use case: HRA queries).
Location should be union of part_of has_soma_location.

Locate the existing GRLC queries and the HRA query use case first; no file or test is named in the issue. Confirm how cell type subsets are represented and how location currently uses part_of and has_soma_location, then verify the query restricts both cell type by subset and location using their union.

Written by the indexing model from the issue text.