feat: implement cchecksum for ~2x faster checksumming

eth_pydantic_types/address.py

@@ -35,15 +35,11 @@ def __eth_pydantic_validate__(cls, value: Any, info: Optional[ValidationInfo] =
         return cls.to_checksum_address(value)
 
     @classmethod
-    def to_checksum_address(cls, value: str) -> "ChecksumAddress":
-        # perf: eth_utils imports are too slow. Hence they are localized.
-        from eth_utils import is_checksum_address, to_checksum_address
-
-        if is_checksum_address(value):
-            return value  # type: ignore[return-value]
-
-        else:
-            return to_checksum_address(value)
+    def to_checksum_address(cls, value: str) -> ChecksumAddress:
+        # perf: localized import for module loading performance reasons.
+        from cchecksum import to_checksum_address
+
+        return to_checksum_address(value)
 
 
 class _AddressTypeFactory:

setup.py

@@ -76,6 +76,7 @@
     url="https://github.com/ApeWorX/eth-pydantic-types",
     include_package_data=True,
     install_requires=[
+        "cchecksum>=0.0.3,<1",
         "hexbytes>=0.3.1,<2",
         "eth-utils>=2.3.1,<6",
         "eth-typing>=3.5.2,<6",