Bug 36996: Add z3950Status system preference

Bug 36996: Add z3950Status system preference

This bug adds a new system preference 'z3950Status' which takes a yaml block and marks any items matching
the conditions as unavailable via z3950 results

It obeys the existing z3950 extra fields, adding item ststus to field $k

To test:
0 - Apply patch, update database
1 - Setup your koha to use itself as a z39 source in Administration/Z3950/SRU servers:
    host: localhost
    port 2100
    database: biblios
    syntax: MARC21 (or UNIMARC if applicable)
2 - Uncomment the config line in /etc/koha/sites/kohadev/z3950/config.xml
    Also make sure to remove the backslashes escaping the hyphens
3 - Restart all
4 - Cataloging - New from Z3950
5 - Search your records, view the marc to confirm status subfield $k is included
6 - Add items to a record with various statuses (lost,damaged,withdrawn) and itemtypes
7 - Edit syspref AdditionalFieldsInZ3950ResultSearch o add 952$k
8 - Search for record above - confirm statuses show as expected
9 - Edit new syspref z3950Status - confirm the language of the pref makes sense
    itype: [BK]
    ccode: [REF]
10 - Search z39 again and confirm items and collection codes are marked 'SYSPREF' in $k
11 - Edit Authorized values - add category Z3950_STATUS
12 - Add authorized vlaue: SYSPREF with Description: System preferenced
13 - Restart all
14 - Search z39 again and confirm statuses show new description

Sponsored by: Northeast Kansas Library System <https://www.nekls.org>
Sponsored by: South East Kansas Library System <https://www.sekls.org>
Signed-off-by: Phil Ringnalda <phil@chetcolibrary.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>