Add implementation plans 7-11: INSERT, UPDATE, DELETE, UNION, digest

Plan 7: TableRefParser extraction + INSERT/REPLACE deep parser (closes #5)
Plan 8: UPDATE deep parser with multi-table JOIN + FROM (closes #6)
Plan 9: DELETE deep parser with multi-table forms (closes #7)
Plan 10: CompoundQueryParser with UNION/INTERSECT/EXCEPT (closes #8)
Plan 11: Query digest with AST + token-level modes (closes #9)

Author: renecannao