Bug 34677: Update to MARC21 relator terms list (August 8, 2023 technical notice)

Bug 34677: Update to MARC21 relator terms list (August 8, 2023 technical notice)

This patch adds missing relator codes/terms to the marc21_relatorterms.yaml file in accordance with the August 8, 2023 technical notice.

https://www.loc.gov/marc/relators/tn230808rel.html

To test:
1. Apply patch and restart
2. Go to Administration > Authorized values > RELTERMS
   --> New terms should be there

anc - Announcer
aue - Audio engineer
aup - Audio producer
bka - Book artist
cad - Casting director
cop - Camera operator
dbd - Dubbing director
djo - DJ
edd - Editorial director
fon - Founder
mka - Makeup artist
mup - Music programmer
mxe - Mixing engineer
nan - News anchor
onp - Onscreen participant
rap - Rapporteur
rxa - Remix artist
sde - Sound engineer
sfx - Special effects provider
swd - Software developer
tau - Television writer
tlg - Television guest
tlh - Television host
vfx - Visual effects provider

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