feat: add real assert function

crates/erg_compiler/codegen.rs

@@ -1682,6 +1682,7 @@ impl PyCodeGenerator {
             ControlKind::While => Identifier::public("while__"),
             ControlKind::With => Identifier::public("with__"),
             ControlKind::Discard => Identifier::public("discard__"),
+            ControlKind::Assert => Identifier::public("assert__"),
             kind => todo!("{kind:?}"),
         };
         self.emit_call_local(local, args);

crates/erg_compiler/lib/std/_erg_control.py

@@ -24,6 +24,8 @@ def with__(obj, body):
 def discard__(obj):
     pass
 
+def assert__(test, msg=None):
+    assert test, msg
 
 def then__(x, f):
     if x == None or x == NotImplemented: