Add support for Hive auto.purge property

[electrum]

Hive has a boolean table property auto.purge which we should expose as a Presto table property in the Hive connector.

See https://issues.apache.org/jira/browse/HIVE-9118

[tusharag171]

Working on this

[findepi]

@electrum is this issue only about exposing a property, or about changing behavior?
If the former, I'd consider #954

[sshardool]

The behavior of skipping the .Trash during the table drop can be achieved in at least two different ways (which are not mutually exclusive)
(1) Provide an auto.purge property during table creation
(2) Setting the property ifPurge in the environment context during table drop

I started making changes for (2) but I made them in a manner such that the decision to skip the Trash could be made based on session property configuration. As a result I passed a ConnectorSession reference all the way to the ThriftHiveMetastoreClient.
Modified ThriftHiveMetastoreClient::dropTable looks like this:

    @Override
    public void dropTable(String databaseName, String name, boolean deleteData, Optional<ConnectorSession> session)
            throws TException
    {
        if (session.isPresent() && session.get().getProperty(HiveSessionProperties.PURGE_TABLE_DATA_ON_DROP, Boolean.class)) {
            EnvironmentContext envContext = new EnvironmentContext(ImmutableMap.of("ifPurge", "true"));
            client.drop_table_with_environment_context(databaseName, name, deleteData, envContext);
        }
        else {
            client.drop_table(databaseName, name, deleteData);
        }
    }

If there is interest I can look into creating a PR for this.