Update EIP-7928: Update StorageKey and StorageValue type definitions #10817
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This updates the StorageKey and StorageValue block access list type definitions to uint256.
The reasoning for this change is to reduce the size of the rlp encoded BALs. The rlp encoding of small slots takes less space when encoded as a number than when encoded as bytes32. For example the uint256 rlp encoding of slot 1 takes a single byte while the bytes32 rlp encoding takes 33 bytes due to the leading zeros which can/should be excluded to save space.