fix: backport Tag.random() to fix log_service.test.ts build

Author: AztecBot

yarn-project/stdlib/src/logs/tag.ts

@@ -1,5 +1,5 @@
 import { poseidon2Hash } from '@aztec/foundation/crypto/poseidon';
-import type { Fr } from '@aztec/foundation/curves/bn254';
+import { Fr } from '@aztec/foundation/curves/bn254';
 import type { ZodFor } from '@aztec/foundation/schemas';
 
 import { schemas } from '../schemas/schemas.js';
@@ -36,6 +36,10 @@ export class Tag {
     return this.value.equals(other.value);
   }
 
+  static random(): Tag {
+    return new Tag(Fr.random());
+  }
+
   static get schema(): ZodFor<Tag> {
     return schemas.Fr.transform((fr: Fr) => new Tag(fr));
   }