imp: simplified light client interface

src/interfaces/ILightClient.sol

@@ -12,16 +12,8 @@ interface ILightClient is ILightClientMsgs {
     function updateClient(bytes calldata updateMsg) external returns (UpdateResult);
 
     /// @notice Querying the (non)membership of the key-value pairs
-    /// @return The timestamp of the verification height in the counterparty chain, e.g., unix timestamp in seconds.
-    function batchVerifyMembership(MsgBatchMembership calldata batchVerifyMsg) external view returns (uint32);
-
-    /// @notice Updating the client and querying the (non)membership of the key-value pairs on the updated consensus
-    // state.
-    /// @return The timestamp of the verification height in the counterparty chain
-    // and the result of the update operation.
-    function updateClientAndBatchVerifyMembership(MsgBatchMembership calldata batchVerifyMsg)
-        external
-        returns (uint32, UpdateResult);
+    /// @return The unix timestamp of the verification height in the counterparty chain in seconds.
+    function verifyMembership(MsgMembership calldata msg_) external view returns (uint32);
 
     /// @notice Misbehaviour handling, moves the light client to the frozen state if misbehaviour is detected
     /// @param misbehaviourMsg The misbehaviour message

src/msgs/ILightClientMsgs.sol

@@ -10,26 +10,17 @@ interface ILightClientMsgs {
         bytes value;
     }
 
-    /// @notice Initializes the light client with a trusted client state and consensus state
-    /// @dev Should be used in the constructor of the light client contract
-    struct MsgInitialize {
-        /// Initial client state
-        bytes clientState;
-        /// Initial consensus state
-        bytes consensusState;
-    }
-
     /// @notice Message for querying the (non)membership of the key-value pairs in the Merkle root at a given height.
     /// @dev If a value is empty, then we are querying for non-membership.
     /// @dev The proof may differ depending on the client implementation and whether
     /// `batchVerifyMembership` or `updateClientAndBatchVerifyMembership` is called.
-    struct MsgBatchMembership {
+    struct MsgMembership {
         /// The proof
         bytes proof;
         /// Height of the proof
         IICS02ClientMsgs.Height proofHeight;
         /// The key-value pairs
-        KVPair[] keyValues;
+        KVPair kvPair;
     }
 
     /// @notice The result of an update operation