fix: allow getting contract types for non-checksummed addresses

[antazoey]

What I did

Was unable to get contract types when address was not checksummed and I got confused.

How I did it

Check if address type (which checks if checksum) and if not, convert it.

How to verify it

address.lower() <-- use this as a value

Checklist

• Passes all linting checks (pre-commit and CI jobs)
• New test cases have been added and are passing
• Documentation has been updated
• PR title follows Conventional Commit standard (will be automatically included in the changelog)

[antazoey]

#58 oops