new(tests): EIP-7623: Add transaction validity tests

tests/prague/eip7623_increase_calldata_cost/__init__.py

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+"""
+abstract: Test [EIP-7623: Increase calldata cost](https://eips.ethereum.org/EIPS/eip-7623)
+    Tests for  [EIP-7623: Increase calldata cost](https://eips.ethereum.org/EIPS/eip-7623).
+"""

tests/prague/eip7623_increase_calldata_cost/spec.py

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+"""
+Defines EIP-7623 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_7623 = ReferenceSpec("EIPS/eip-7623.md", "9104d079c04737b1fec5f7150715f024d8028558")
+
+
+# Constants
+@dataclass(frozen=True)
+class Spec:
+    """
+    Parameters from the EIP-7623 specifications as defined at
+    https://eips.ethereum.org/EIPS/eip-7623
+    """
+
+    STANDARD_TOKEN_COST = 4
+    TOTAL_COST_FLOOR_PER_TOKEN = 10