add a useInterval hook and move useNetwork hook to the hook folder

ts/hooks/useInterval.ts

@@ -0,0 +1,25 @@
+import React from 'react';
+
+export const useInterval = (callback: any, delay: number | null) => {
+  const savedCallback = React.useRef<any>();
+
+  React.useEffect(() => {
+    savedCallback.current = callback;
+  }, [callback]);
+
+  React.useEffect(() => {
+    function tick() {
+      if (savedCallback && savedCallback.current && savedCallback.current) {
+        savedCallback.current();
+      }
+    }
+    if (delay !== null) {
+      const id = global.setInterval(tick, delay);
+      tick();
+      return () => {
+        global.clearInterval(id);
+      };
+    }
+    return;
+  }, [delay]);
+};