Feature implement Search functionality

Depends on #18

**Instructions:**

Still in the `` component, implement the `search` method. It must use the `searchVal` variable (that you just passed from the `` component) to **filter** the search results. The filter function should return bookings where `firstName` or `surname` match `searchVal`. Once filtered, use the `setBookings` function to update the results rendered in ``.

**Test:**

Verify that when you enter an existing first name or surname and submit the form, the results are filtered accordingly in the customers table.