Release v0.3.0

• If interrupted, always cancel the extract job (if one is in progress) and clean up any extracted files in the bucket
• Extract selected properties only - this will significantly improve overall performance if only a couple of properties are required
• Reduce minimum required Python version to 3.8 (previously set to 3.9 for no good reason)
• Additionally support google_application_credentials config as an object
• Misleading setting filter_datasets renamed to filter_tables
• Support shell pattern matching for table names with filter_tables