LDAP_DISPLAY_NAME_ATTRIBUTE merge multiple values

[dusatvoj]

Describe the feature you'd like
Ability to merge 2 values in LDAP_DISPLAY_NAME_ATTRIBUTE like:
LDAP_DISPLAY_NAME_ATTRIBUTE={givenName sn}

Describe the benefits this feature would bring to BookStack users
Merging first and last name from LDAP when fhere is no full name filled in LDAP

[ssddanbrown]

Thanks for the original request @dusatvoj.
Thanks to @MatthieuLeboeuf this has now been implemented via #5295 and is due to be part of the next feature release.

The syntax would follow the example: LDAP_DISPLAY_NAME_ATTRIBUTE="firstname|lastname".