Improve messaging on indexing frozen collections

When attempting to create an index on a frozen collection the error message produced can be improved to provide more detail about the problem and possible workarounds. Currently, a user will receive a message indicating "...Frozen collections only support full() indexes" which is not immediately clear for users new to Cassandra indexing and datatype compatibility.

Here is an example:

cqlsh> CREATE KEYSPACE test WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1};

cqlsh> CREATE TABLE test.mytable ( id int primary key, addresses frozen<set<text>> );

cqlsh> CREATE INDEX mytable_addresses_idx on test.mytable (addresses);
 InvalidRequest: Error from server: code=2200 [Invalid query] message="Cannot create values() index on frozen column addresses. Frozen collections only support full() indexes"

I'm proposing possibly enhancing the messaging to something like this.

Cannot create values() index on frozen column addresses. Frozen collections only support indexes on the entire data structure due to immutability constraints of being frozen, wrap your frozen column with the full() target type to index properly.