Add a time-based cache for the progress result from the API

frontend/types/global.d.ts

@@ -1,4 +1,4 @@
-interface Progress {
+interface ProgressType {
     percentageOfIpv4Scanned: number; // assuming this is a number
     totalFiltered: bigint;
     amountOfIpv4Left: bigint;
@@ -6,4 +6,9 @@ interface Progress {
     discardedDbSize: bigint;
     filteredDbSize: bigint;
     myDbSize: bigint;
-}
+}
+
+type CacheEntry<T> = {
+    data: T;
+    timestamp: number;
+};