Add missing API methods across language bindings (#8150)

* Initial plan

* Add API coherence improvements for C#, Python, C++, and TypeScript

- C#: Add SubstituteFuns method to Expr class
- Python: Add update method to ExprRef class
- C++: Add update method to expr class
- TypeScript: Add complete Statistics API with Statistics interface, StatisticsEntry interface, StatisticsImpl class, and statistics() methods for Solver, Optimize, and Fixedpoint

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* Add Z3_stats import and Statistics types to TypeScript bindings

- Add Z3_stats to imports in types.ts and high-level.ts
- Add Statistics and StatisticsEntry to type imports in high-level.ts
- Fixes missing type references identified in code review

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

src/api/python/z3/z3.py

@@ -1154,6 +1154,30 @@ class ExprRef(AstRef):
         else:
             return []
 
+    def update(self, *args):
+        """Update the arguments of the expression.
+        
+        Return a new expression with the same function declaration and updated arguments.
+        The number of new arguments must match the current number of arguments.
+        
+        >>> f = Function('f', IntSort(), IntSort(), IntSort())
+        >>> a = Int('a')
+        >>> b = Int('b')
+        >>> c = Int('c')
+        >>> t = f(a, b)
+        >>> t.update(c, c)
+        f(c, c)
+        """
+        if z3_debug():
+            _z3_assert(is_app(self), "Z3 application expected")
+            _z3_assert(len(args) == self.num_args(), "Number of arguments does not match")
+            _z3_assert(all([is_expr(arg) for arg in args]), "Z3 expressions expected")
+        num = len(args)
+        _args = (Ast * num)()
+        for i in range(num):
+            _args[i] = args[i].as_ast()
+        return _to_expr_ref(Z3_update_term(self.ctx_ref(), self.as_ast(), num, _args), self.ctx)
+
     def from_string(self, s):
         pass