allow accessList storageKeys to be bytes

[pacrob]

What was wrong?

web3 generates accessLists with storageKeys of type HexBytes, but eth-account only allows them to be ints or 0x-prefixed strings.

Closes #286

How was it fixed?

Set validation to allow them to be bytes. Might make more sense to stay stricter only allow HexBytes

Todo:

• [ ] Clean up commit history
• [ ] Add or update documentation related to these changes
• [ ] Add entry to the release notes

Cute Animal Picture

[pacrob]

Wrong direction on this. web3's AccessListEntry uses only HexStr, not HexBytes, so it shouldn't be returning those in the storageKeys