Next acc number cli (#237)

## Describe your changes and provide context
Accounts have a monotonically increasing number associated with it
that's stored in the keeper. Allow this number to be exposed for dau's
## Testing performed to validate your change
Tested locally:
```
 ~  seid q auth next-account-number                                                                              ok | 09:47:12 PM
18
```

proto/cosmos/auth/v1beta1/query.proto

@@ -28,6 +28,11 @@ service Query {
   rpc Params(QueryParamsRequest) returns (QueryParamsResponse) {
     option (google.api.http).get = "/cosmos/auth/v1beta1/params";
   }
+
+  // NextAccountNumber queries the next account number assigned
+  rpc NextAccountNumber(QueryNextAccountNumberRequest) returns (QueryNextAccountNumberResponse) {
+    option (google.api.http).get = "/cosmos/auth/v1beta1/nextaccountnumber";
+  }
 }
 
 // QueryAccountsRequest is the request type for the Query/Accounts RPC method.
@@ -72,3 +77,14 @@ message QueryParamsResponse {
   // params defines the parameters of the module.
   Params params = 1 [(gogoproto.nullable) = false];
 }
+
+
+
+// QueryNextAccountRequest is the request type for the Query/NextAccountNumber RPC method.
+message QueryNextAccountNumberRequest {}
+
+// QueryNextAccountResponse is the response type for the Query/NextAccountNumber RPC method.
+message QueryNextAccountNumberResponse {
+  // count defines the next account number.
+  uint64 count = 1;
+}

x/auth/client/cli/query.go

@@ -43,6 +43,7 @@ func GetQueryCmd() *cobra.Command {
 		GetAccountCmd(),
 		GetAccountsCmd(),
 		QueryParamsCmd(),
+		QueryNextAccountNumberCmd(),
 	)
 
 	return cmd
@@ -79,6 +80,38 @@ $ <appd> query auth params
 	return cmd
 }
 
+// QueryNextAccountNumberCmd returns the command handler for evidence parameter querying.
+func QueryNextAccountNumberCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "next-account-number",
+		Short: "Query the next account number",
+		Args:  cobra.NoArgs,
+		Long: strings.TrimSpace(`Query the next account number parameters:
+
+$ <appd> query auth next-account-number
+`),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			clientCtx, err := client.GetClientQueryContext(cmd)
+			if err != nil {
+				return err
+			}
+
+			queryClient := types.NewQueryClient(clientCtx)
+			res, err := queryClient.NextAccountNumber(cmd.Context(), &types.QueryNextAccountNumberRequest{})
+			if err != nil {
+				return err
+			}
+
+			fmt.Printf("%d\n", res.Count)
+			return nil
+		},
+	}
+
+	flags.AddQueryFlagsToCmd(cmd)
+
+	return cmd
+}
+
 // GetAccountCmd returns a query account that will display the state of the
 // account at a given address.
 func GetAccountCmd() *cobra.Command {

x/auth/keeper/grpc_query.go

@@ -83,3 +83,13 @@ func (ak AccountKeeper) Params(c context.Context, req *types.QueryParamsRequest)
 
 	return &types.QueryParamsResponse{Params: params}, nil
 }
+
+func (ak AccountKeeper) NextAccountNumber(c context.Context, req *types.QueryNextAccountNumberRequest) (*types.QueryNextAccountNumberResponse, error) {
+	if req == nil {
+		return nil, status.Error(codes.InvalidArgument, "empty request")
+	}
+	ctx := sdk.UnwrapSDKContext(c)
+	nextAccountNumber := ak.GetNextAccountNumber(ctx)
+
+	return &types.QueryNextAccountNumberResponse{Count: nextAccountNumber}, nil
+}