Add CQL support

[SpencerC]

• Add CQL flavor.
• Add support for CQL argument compilation.
• Adopt substests for interpolation tests.
• Add support for CQL interpolation.
• Add support for CQL blobs: https://docs.datastax.com/en/cql-oss/3.x/cql/cql_reference/blob_r.html
• Add CQL timestamp interpolation support: https://docs.datastax.com/en/cql-oss/3.x/cql/cql_reference/timestamp_type_r.html
• Add builder test for CQL.
• Add support for the NOW function: https://docs.datastax.com/en/cql-oss/3.3/cql/cql_reference/timeuuid_functions_r.html?hl=now
• Add support for CQL update IF statement: https://docs.datastax.com/en/cql-oss/3.3/cql/cql_reference/cqlUpdate.html#Conditionallyupdatingcolumns
• Drop table prefixes for CQL SELECTs.
• Switch to single quoting for CQL queries: https://docs.datastax.com/en/cql-oss/3.3/cql/cql_reference/escape_char_r.html
• Update documentation.
• Use valid CQL in tests.
• Support CQL LIMIT.