Kudu: add kudu.timezone for TIMESTAMP conversion

[zy-kkk]

• Summary: Introduces kudu.timezone to control how TIMESTAMP values are conver
  ted between Trino and Kudu,to ensure co
  nsistent semantics when Kudu stores UTC timestamps while users expect local time
  interpretation.
• Changes:
  • KuduClientConfig: add kudu.timezone (default UTC), initialize timezone o
    ffset via TimestampHelper.
  • TimestampHelper: new utility using java.time to compute zone offset in mil
    liseconds and cache it.
  • KuduPageSink: when writing TIMESTAMP_MILLIS, subtract the offset (applied
    in microseconds).
  • TypeHelper: when reading TIMESTAMP_MILLIS, add the offset; adjust getJava Value and getLong.
  • Docs: add #kudu.timezone = UTC to Kudu connector configuration docs.
• Usage:
  • Set in etc/catalog/kudu.properties: kudu.timezone=Asia/Shanghai (default
    s to UTC).