Rename proto Req/Res to Pagination (#6796)

* Rename proto Req to Pagination

* Change Res to Pagination

Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

x/slashing/client/cli/query.go

@@ -93,7 +93,7 @@ $ <appcli> query slashing signing-infos
 
 			queryClient := types.NewQueryClient(clientCtx)
 
-			params := &types.QuerySigningInfosRequest{Req: client.ReadPageRequest(cmd.Flags())}
+			params := &types.QuerySigningInfosRequest{Pagination: client.ReadPageRequest(cmd.Flags())}
 			res, err := queryClient.SigningInfos(context.Background(), params)
 			if err != nil {
 				return err