Release 4.1.0

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[istreeter]

@voropaevp I made a few amendments while I was testing it out -- I hope that's OK:

• Removed the \n character from the message derived from the SqlException. Only because this message gets sent to our alerting services and I don't know how it would look there.
• Added config validation for Snowflake so we don't get nasty exceptions thrown on account.get or region.get.
• Removed account from the Snowflake jdbc properties, now that it's optional. I don't think it does anything anyway -- it's not listed in the Snowflake connection parameter reference.
• Removed my commit for the collector_tstamp_date column because we're going to do it with Databricks loader: Support for generated columns #951 instead.