Add canonicalization for two-variable comprehensions

PiperOrigin-RevId: 961186694

Author: l46kok

verifier/src/main/java/dev/cel/verifier/BUILD.bazel

@@ -140,6 +140,7 @@ java_library(
         "//common/ast",
         "//common/ast:mutable_expr",
         "//common/navigation:common",
+        "//common/navigation:expr_util",
         "//common/navigation:mutable_navigation",
         "//common/values:cel_byte_string",
         "//optimizer:ast_optimizer",