The global state for DP query is intended for aspects of the query that change across samples under the query's own control. It was therefore unnecessary to wrap "l2_norm_clip" and "sum_stddev" in the namedtuple _GlobalState for the basic GaussianQuery classes.
PiperOrigin-RevId: 237528962
1. Rename PrivateQuery to DPQuery.
2. Move construction of DPQuery to outside of optimizer.
3. Remove PrivateAverageQuery and PrivateSumQuery, and rename DPQuery's 'get_query_result' method to 'get_noised_result'. Rename private_queries.py to dp_query.py.
4. Remove thrice-replicated run_query function from the test classes and replace with a single function in new test_utils.py.
5. Add functions gaussian_sum_query_from_noise_multplier and gaussian_average_query_from_noise_multplier.
PiperOrigin-RevId: 230595991
