Add support for inheritable arrays

[tobiemh]

Summary

• Add InheritableArray support so .return() callbacks can return arrays (e.g., [r.name, r.age]) in addition to the existing single-field and object patterns, with full type inference and correct SurrealQL rendering
• Fix mutation query return projections: callback-based .return() on CREATE, UPDATE, DELETE, UPSERT, INSERT, and RELATE now correctly uses RETURN VALUE <expr> (instead of RETURN <expr>) and updates the runtime type to match the projection, so parse() validates against the projected shape rather than the full table schema
• Add comprehensive test coverage for all return projection patterns across all query types