(feat) initial pagination for ListHomeChanges

changes.proto

@@ -261,9 +261,36 @@ message GetAppSummariesResponse {
   repeated changes.AppSummary apps = 1;
 }
 
-message ListHomeChangesRequest {}
+message PaginationRequest {
+  // The number of items to return in a single page
+  int32 pageSize = 1;
+
+  // The page number to return. the first page is 0
+  int32 page = 2;
+}
+
+message PaginationResponse {
+  // The number of items in the current page
+  int32 pageSize = 1;
+
+  // The total number of items available. Expensive to calculate https://www.cybertec-postgresql.com/en/pagination-problem-total-result-count/
+  // this is done as a separate query
+  int32 totalItems = 2;
+
+  // The current page number
+  int32 page = 3;
+
+  // The total number of pages available. based on the totalItems and pageSize.
+  int32 totalPages = 4;
+}
+
+message ListHomeChangesRequest {
+  PaginationRequest pagination = 1;
+}
+
 message ListHomeChangesResponse {
   repeated ChangeSummary changes = 1;
+  PaginationResponse pagination = 2;
 }
 
 message ListHomeAppsRequest {}