General Changes

• Added query_max_memory session property. Note: this session property cannot increase the limit above the limit set by the query.max-memory configuration option.
• Fixed task leak caused by queries that finish early, such as a LIMIT query or cancelled query, when the cluster is under high load.
• Added task.info-refresh-max-wait to configure task info freshness.
• Add support for DELETE to language and connector SPI.
• Reenable error classification code for syntax errors.
• Fix out of bounds exception in lower() and upper() when the string contains the code point U+10FFFF.