SingleStore JDBC Driver 1.2.1

• Refactor ClientPreparedStatement/ServerPreparedStatemnt
• load-balance distribution ensuring repartition after failover
• Adding keyPassword option
• using "/client prepare/" prefix for Client Prepared Statement
• Update benchmark tests;
• Remove canUseServerTimeout and canUseServerMaxRows as not supported by engine
• Correcting java 11+ socket options setting
• Update database metadata methods to handle table name case sensitivity
• Improve batch insert with rewrite option: check packet size and split to fix maxAllowedPacket size
• Add connection string parameter: returnMultiValuesGeneratedIds