Support updating TXT records with a certain prefix in the value ( maybe combined with the solo=true )

[flybyray]

Consider there is a TXT record a so called mail SPF record. Currently if the module user would like to update an existing record of that type, the module would create a new record.

a simple case to reproduce this would be by just reordering 2 different ip4 in an existing record.

from: v=spf1 ip4:127.0.0.1 ip4:127.0.0.2 to: v=spf1 ip4:127.0.0.2 ip4:127.0.0.1