Stop emitting unredacted thrift responses by default

[susodapop]

Over in dbt-databricks we want to wire-in pysql logs but have found that the complete content of every thrift response is included in the outputted logs. These are tough to redact with a regex because thrift doesn't implement a deterministic kind of serialisation. Instead, the raw bytes are interpreted as utf-8 strings. Rather than fix this in dbt-databricks, we should modify pysql to separate the unredacted logs under a separate logger that most tools can simply ignore.

[susodapop]

PR incoming with this change.