[Feature Request] Save out the full URL for the campsite if there's a booking

[bryanwhiting]

For Big Basin Redwoods, which has campground id of 3, the facility_id could be 333 for Seqouia group. See https://www.reservecalifornia.com/Web/#!park/3/333 to compare.

❯ find-campsites -c "Big Basin Redwoods SP" --api reservecalifornia
INFO	2022-07-26 22:26:24,352	ReserveCalifornia must use facility ID. Searching for facility IDs using provided `campground_id` (note: this must be the park that the campground is in)
INFO	2022-07-26 22:26:24,558	Found campground: Big Basin Redwoods SP (campground id: 3)
INFO	2022-07-26 22:26:24,787	Found facilities in park:

campground                                 facility_id
Huckleberry Campground (sites 42-75)       336
Lower Blooms Creek (sites 103-138)         332
Sempervirens Campground (sites 157-188)    335
Sequoia Group 1 & 2                        333
Sky Meadow Group 1 & 2                     338
Upper Blooms Creek (sites 139-156)         339
Wastahi Campground (sites 76-102)          337

When there's a match for a search, it should return the URL https://www.reservecalifornia.com/Web/#!park/3/333.