Data too long for column 'XWS_VALUE' issue when saving the ldap fields mapping

The issue appears when I try to save a big list of LDAP fields mappings because the property (ldap_fields_mapping) used to save the fields mappings on the XWiki.XWikiPreferences object is a String property, so an error is returned when we try to save a string longer than the property limits.

A better solution is to change the type of the property 'ldap_fields_mapping' to text like the ldap group mapping field.

To reproduce

• Install LDAP Application 9.2.3
• Open the LDAP configuration form on Administration>>LDAP
• On 'Mapping Of the fields of the LDAP users' add the values below and click on the save button

first_name=givenName
last_name=sn
email=mail
xxxxxx1=yyyyyyyyyyyyyyyyyyy1
xxxxxxxx2=yyyyyyyyyyyyyyyyyy2
xxxxx3=yyyyyyyyyyyyyyyyyy3
xxxxx4=yyyyyyyyyyyyyyyyyy4
xxxxx5=yyyyyyyyyyyyyyyyyy5
xxxxx6=yyyyyyyyyyyyyyyyyy6
xxxxx7=yyyyyyyyyyyyyyyyyy7
xxxxx8=yyyyyyyyyyyyyyyyyy8