Polysat: first pass at forbidden intervals (not yet fully integrated into solver) (#5227)

* Add interval class

* Take dependency as const reference

* Compute forbidden intervals for ule-constraints

* Add class for evaluated interval

* We need the evaluated bounds as well

* Don't add constraint to cjust multiple times (hack, to be improved later)

* typo

* More interval helpers

* Add constraint::ult factory function

* Fix forbidden interval condition

* Add solver::has_viable

* Add conflict explanation using forbidden intervals (not yet fully integrated into solver)

src/math/polysat/CMakeLists.txt

@@ -4,6 +4,7 @@ z3_add_component(polysat
     eq_constraint.cpp
     ule_constraint.cpp
     var_constraint.cpp
+    forbidden_intervals.cpp
     justification.cpp
     log.cpp
     solver.cpp