alternator: throw on unsupported expressions
alternator: throw on unsupported expressions

When an unsupported expression parameter is encountered -
KeyConditionExpression, ConditionExpression or FilterExpression
are such - alternator will return an error instead of ignoring
the parameter.

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