tests: add spec and conftest for transient storage tests

tests/cancun/eip1153_tstore/__init__.py

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+"""
+EIP-1153 Tests
+"""

tests/cancun/eip1153_tstore/conftest.py

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+"""
+Pytest plugin local to EIP-1153 tests.
+"""
+from typing import List
+
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def eips(eip_enabled: bool = True) -> List[int]:
+    """
+    Returns a list of EIPs to enable in the client t8n tool.
+    """
+    return [1153] if eip_enabled else []

tests/cancun/eip1153_tstore/spec.py

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+"""
+Defines EIP-1153 specification constants and functions.
+"""
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class ReferenceSpec:
+    """
+    Defines the reference spec version and git path.
+    """
+
+    git_path: str
+    version: str
+
+
+ref_spec_1153 = ReferenceSpec("EIPS/eip-1153.md", "6f0be621c76a05a7b3aaf0e9297afd425c26e9d0")
+
+
+@dataclass(frozen=True)
+class Spec:
+    """
+    Parameters from the EIP-1153 specifications as defined at
+    https://eips.ethereum.org/EIPS/eip-1153
+    """
+
+    TLOAD_OPCODE_BYTE = 0x5C
+    TSTORE_OPCODE_BYTE = 0x5D
+    TLOAD_GAS_COST = 100
+    TSTORE_GAS_COST = 100