Bug 35106: Add patron search autocomplete to Patron ID input

Bug 35106: Add patron search autocomplete to Patron ID input

Test plan, k-t-d:
1) Install FreeForm and enable ILLmodule, run:
bash <(curl -s https://raw.githubusercontent.com/ammopt/koha-ill-dev/master/start-ill-dev.sh)
2) Visit /cgi-bin/koha/ill/ill-requests.pl
3) Create 'New ILL request'
4) Select the request type, input cardnumber '42' and select a library. Hit 'Create'
5) Manage the request created just now: click the request id or 'manage request' button from the table
6) Click "Edit request" from the top actions toolbar
7) Input text in Patron ID e.g. 'koha'. Notice you get patron suggestions.
8) Click one of the suggestions and save the request, notice the patron is saved correctly.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>