Fetches list of data entries, optionally filtered by address prefix.

        Request:
            query:
                - head: The id of the block to use as the head of the chain
                - address: Return entries whose addresses begin with this
                prefix

        Response:
            data: An array of leaf objects with address and data keys
            head: The head used for this query (most recent if unspecified)
            link: The link to this exact query, including head block
            paging: Paging info and nav, like total resources and a next link

async def list_state(self, request):
        """Fetches list of data entries, optionally filtered by address prefix.

        Request:
            query:
                - head: The id of the block to use as the head of the chain
                - address: Return entries whose addresses begin with this
                prefix

        Response:
            data: An array of leaf objects with address and data keys
            head: The head used for this query (most recent if unspecified)
            link: The link to this exact query, including head block
            paging: Paging info and nav, like total resources and a next link
        """
        paging_controls = self._get_paging_controls(request)

        head, root = await self._head_to_root(request.url.query.get(
            'head', None))
        validator_query = client_state_pb2.ClientStateListRequest(
            state_root=root,
            address=request.url.query.get('address', None),
            sorting=self._get_sorting_message(request, "default"),
            paging=self._make_paging_message(paging_controls))

        response = await self._query_validator(
            Message.CLIENT_STATE_LIST_REQUEST,
            client_state_pb2.ClientStateListResponse,
            validator_query)

        return self._wrap_paginated_response(
            request=request,
            response=response,
            controls=paging_controls,
            data=response.get('entries', []),
            head=head)