Fix commands against table with unsupported datatype, add IT ability to directly execute cqlStatement

[Yuqi-Du]

This PR fixes #1730 first, with the fix, Data API commands can be executed against table with unsupported dataType without failing ungracefully. E.G. Currently table does not support countCommands, so it should fail with UNSUPPORTED_TABLE_COMMAND

Also, this PR adds IT to cover the fix. Previously, we don't have the ability for Integration Tests to execute cql statement directly against C* backend. Now with this PR, we can do that, and then we can create cql tables with DataTypes that Data API does not support. fixes: #1731, https://datastax.jira.com/browse/C2-3799

Checklist

• [x] Changes manually tested
• [x] Automated Tests added/updated
• [x] Documentation added/updated
• [x] CLA Signed: DataStax CLA