Better key composition for entities with semantic resolutions

A second patch on top of 0.6.0’s schema-aware query.

Key composition for entities with semantic resolutions

If your DDB Toolbox entity uses semantic resolutions in its keys — values derived from another entity or from a transformation rather than a direct attribute — the schema-aware query was composing those keys incorrectly. Queries returned no rows or the wrong rows. Fixed here. Key composition now follows the resolution chain to its end before building the query.