feat: Choose random color on collection creation (#3912)

Choose a random color from a shared color palette between backend
and frontend during collection creation.

shared/random.ts

@@ -2,4 +2,8 @@ const randomInteger = (min: number, max: number) => {
   return Math.floor(Math.random() * (max - min + 1) + min);
 };
 
-export { randomInteger };
+const randomElement = <T>(arr: T[]): T => {
+  return arr[randomInteger(0, arr.length - 1)];
+};
+
+export { randomInteger, randomElement };