Booking : Add Patron Search to Create Reservation

A note that Bill Erickson created an Angular component called <eg-patron-search> -- it would provide just the desired behavior. It's available in Evergreen 3.5, see bug 1859241.

Here's a branch that implements this: user/sandbergja/lp1816655_booking_patron_search

Here's a link: https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/sandbergja/lp1816655_booking_patron_search

Testing instructions from the commit message:

1) Apply this patch
2) Go to Booking > Create Reservation
3) Choose a resource type
4) Choose a time and double click (or press the Create Reservation
   button)
5) Note that there is now a Search for Patrons button
6) Use this button to search for a patron.
7) Click the select button.
8) Note that the patron's barcode appears in the
Patron Barcode field
9) Click Confirm Reservation
10) Note that the reservation was made.

Tested and works perfectly. A sign-off branch is at https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/gcollum/lp1816655_booking_patron_search-signoff

Pushed to master for inclusion in 3.7. Thanks, Jane and Garry!