[I] datalake_agent: Hive Metastore catalog [cloudberry]

["MisterRaindrop (via GitHub)" <gi...@apache.org>]

MisterRaindrop opened a new issue, #2016:
URL: https://github.com/apache/cloudberry/issues/2016

   Part of #2008. Letters (A, B0–B7, C, D, E) are the PRs listed there; this is **B6**.
   
   ### Scope
   - `HiveCatalog` (iceberg-hive-metastore): thrift URI (`hive_metastore_uri` already accepted as a second spelling), HMS lock and commit semantics, pinned `hive-metastore` / `hadoop-common`.
   - Kerberos through the UGI shim from the reference implementation: principal and keytab from server and user-mapping options, login once per credential fingerprint.
   - HMS errors mapped through the B1 interceptor (NOT_FOUND, ALREADY_EXISTS, …).
   - End-to-end against HMS plus MinIO in docker (the compose stack exists); Kerberos login path at unit level. No KDC in CI unless cheap.
   
   ### Out of scope
   Hive tables that are not Iceberg.
   
   ### Depends on
   B3.
   
   ### Acceptance
   - Conformance suite green against HMS; Spark and Cloudberry see each other's tables through the same HMS.
   - Kerberos without a keytab fails at the first call naming the missing file.
   


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