[General] Export some other functions

[ocots]

Export from CTModels:

dim_path_constraints_nl(ocp)
dim_boundary_constraints_nl(ocp)
dim_state_constraints_box(ocp)
dim_control_constraints_box(ocp)
dim_variable_constraints_box(ocp)

[ocots]

But the names are not consistent with state_dimension. Maybe change them before exporting.