Feature implement Search functionality

[SallyMcGrath]

Depends on #18

Instructions:

Still in the <Bookings /> component, implement the search method. It must use the searchVal variable (that you just passed from the <Search /> 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 <SearchResults />.

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.