feat: add ERC-6909 Token and Supply extension

CHANGELOG.md

@@ -22,6 +22,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `SafeErc20` now implements: `try_safe_transfer`, `try_safe_transfer_from`, `transfer_and_call_relaxed`, `transfer_from_and_call_relaxed` and `approve_and_call_relaxed`. #765
 - Add bidirectional conversions between `ruint::Uint` and crypto library `Uint` types behind `ruint` feature toggle. #758
 - Add bidirectional conversions between `Uint` and `u8`, `u16`, `u32`, `u64`, `u128` types. #764
+- Add ERC-6909 Token. #778
+- Add ERC-6909 Supply Extension. # 779
 - Add EDDSA (Ed25519) signature scheme. #757
 
 ### Changed (Breaking)