Returns the requested block as specified by block hash.

def get_block_by_hash(self, block_hash: Hash32) -> BaseBlock:
        """
        Returns the requested block as specified by block hash.
        """
        validate_word(block_hash, title="Block Hash")
        block_header = self.get_block_header_by_hash(block_hash)
        return self.get_block_by_header(block_header)