test/boost/cql_query_test: add test setting synchronous updates property
test/boost/cql_query_test: add test setting synchronous updates property

The test checks if a synchronous_updates property can be set via ALTER
MATERIALIZED VIEW or CREATE MATERIALIZED VIEW statements.

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla