refactor(bal): absence validators -> BalAccountAbsentValues (#2175)

* refactor(bal): absence validators -> BalAccountAbsentValues

* feat: raise for empty lists on BAL absence checks

* refactor: changes from comments on PR #2175

Author: fselmo

docs/CHANGELOG.md

@@ -22,6 +22,7 @@ Test fixtures for use by clients are available for each release on the [Github r
 - ✨ Add tighter validation for EIP-7928 model coming from t8n when filling ([#2138](https://github.com/ethereum/execution-spec-tests/pull/2138)).
 - ✨ Add flexible API for absence checks for EIP-7928 (BAL) tests ([#2124](https://github.com/ethereum/execution-spec-tests/pull/2124)).
 - 🐞 Use ``engine_newPayloadV5`` for `>=Amsterdam` forks in `consume engine` ([#2170](https://github.com/ethereum/execution-spec-tests/pull/2170)).
+- 🔀 Refactor EIP-7928 (BAL) absence checks into a friendlier class-based DevEx ([#2175](https://github.com/ethereum/execution-spec-tests/pull/2175)).
 
 ### 🧪 Test Cases