refactor: add complete and index_cache to ConstraintsSystem

Author: AayushSabharwal

src/systems/optimization/constraints_system.jl

@@ -69,20 +69,29 @@ struct ConstraintsSystem <: AbstractTimeIndependentSystem
     Substitutions generated by tearing.
     """
     substitutions::Any
+    """
+    If a model `sys` is complete, then `sys.x` no longer performs namespacing.
+    """
+    complete::Bool
+    """
+    Cached data for fast symbolic indexing.
+    """
+    index_cache::Union{Nothing, IndexCache}
 
     function ConstraintsSystem(tag, constraints, unknowns, ps, var_to_name, observed, jac,
             name,
             systems,
             defaults, connector_type, metadata = nothing,
-            tearing_state = nothing, substitutions = nothing;
+            tearing_state = nothing, substitutions = nothing,
+            complete = false, index_cache = nothing;
             checks::Union{Bool, Int} = true)
         if checks == true || (checks & CheckUnits) > 0
             u = __get_unit_type(unknowns, ps)
             check_units(u, constraints)
         end
         new(tag, constraints, unknowns, ps, var_to_name, observed, jac, name, systems,
             defaults,
-            connector_type, metadata, tearing_state, substitutions)
+            connector_type, metadata, tearing_state, substitutions, complete, index_cache)
     end
 end