Added verifier module and blob type

da/verifier.py

@@ -0,0 +1,15 @@
+from dataclasses import dataclass
+from typing import List
+from eth2spec.eip7594.mainnet import KZGCommitment as Commitment, KZGProof as Proof
+
+
+@dataclass
+class DABlob:
+    # this should be removed, but for now it shows the purpose
+    index: int
+    column: bytearray
+    column_commitment: Commitment
+    aggregated_column_commitment: Commitment
+    aggregated_column_proof: Proof
+    rows_commitments: List[Commitment]
+    rows_proofs: List[Proof]