Polysat: expand conflict explanation rules (#5366)

* update example to match slides

* Add normalized view of inequalities

* workaround

* Add a conflict explanation rule

* unit clauses should be asserted at the base level

* Add src constraint to interval

* support non-strict case in first rule

* print conflict constraints only once

* update second rule

* update third rule as well

src/math/polysat/ule_constraint.cpp

@@ -288,4 +288,12 @@ namespace polysat {
         return true;
     }
 
+    inequality ule_constraint::as_inequality() const {
+        SASSERT(!is_undef());
+        if (is_positive()) {
+            return { .lhs = lhs(), .rhs = rhs(), .is_strict = false, .src = this };
+        } else {
+            return { .lhs = rhs(), .rhs = lhs(), .is_strict = true, .src = this };
+        }
+    }
 }