fix: type error for callback of on()

Parameter of callback function of on() should have SupabaseRealtimePayload type instead of any Function.

src/lib/SupabaseRealtimeClient.ts

@@ -32,7 +32,7 @@ export class SupabaseRealtimeClient {
    * @param event The event
    * @param callback A callback function that is called whenever the event occurs.
    */
-  on(event: SupabaseEventTypes, callback: Function) {
+  on(event: SupabaseEventTypes, callback: (payload: SupabaseRealtimePayload<any>) => void) {
     this.subscription.on(event, (payload: any) => {
       let enrichedPayload: SupabaseRealtimePayload<any> = {
         schema: payload.schema,