Add Block schema

schemas/__init__.py

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+from .blocks import Block

schemas/blocks.py

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+from typing import List, Optional
+
+from pydantic import BaseModel
+
+
+class Block(BaseModel):
+    block_number: int
+    calls: List[dict]
+    data: dict
+    logs: List[dict]
+    receipts: dict
+    transaction_hashes: List[str]