feat: add new V2 methods for nullifier operations

The new methods `isUnusedV2()`, `assertUnusedV2()`, and `setUsedV2()` have been introduced to provide improved functionality for nullifier operations.

BREAKING CHANGE: deprecate Nullifier.isUnused(), Nullifier.assertUnused(), and Nullifier.setUsed() methods

The existing `Nullifier.isUnused()`, `Nullifier.assertUnused()`, and `Nullifier.setUsed()` methods have been deprecated in favor of the new V2 methods. These deprecated methods will be removed in a future release. Please update your code to use the new V2 methods instead.

CHANGELOG.md

@@ -20,6 +20,11 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Added
 
 - `ForeignField`-based representation of scalars via `ScalarField` https://github.com/o1-labs/o1js/pull/1705
+- Introduced new V2 methods for nullifier operations: `isUnusedV2()`, `assertUnusedV2()`, and `setUsedV2()` https://github.com/o1-labs/o1js/pull/1715
+
+### Deprecated
+
+- Deprecated `Nullifier.isUnused()`, `Nullifier.assertUnused()`, and `Nullifier.setUsed()` methods https://github.com/o1-labs/o1js/pull/1715
 
 ## [1.4.0](https://github.com/o1-labs/o1js/compare/40c597775...ed198f305) - 2024-06-25