otIp6SlaacPrefixFilter

Pointer allows user to filter prefixes and not allow an SLAAC address based on a prefix to be added. `otIp6SetSlaacPrefixFilter()` can be used to set the filter handler. The filter handler is invoked by SLAAC module when it is about to add a SLAAC address based on a prefix. Its boolean return value determines whether the address is filtered (not added) or not.