Make HiveCatalog inheritable for custom IMetaStoreClient

[JingsongLi]

Our internal has a custom meta store which implements Hive IMetaStoreClient, I think it is good to reuse Iceberg HiveCatalog:

• Change HiveMetaStoreClient to IMetaStoreClient. (Actually depends on IMetaStoreClient is enough in Iceberg?)
• Make HiveClientPool pluggable in HiveCatalog, maybe a new constructor like: public HiveCatalog(String name, HiveClientPool clients, Configuration conf).

[pvary]

• Change HiveMetaStoreClient to IMetaStoreClient. (Actually depends on IMetaStoreClient is enough in Iceberg?)

IMetaStoreClient definitely should be enough for Iceberg. We still have to keep the HMS for testing though (or need a replacement implementation)

[kesavkolla]

I also have very similar requirement. I'm not using hadoop or spark I just want to interact with the S3 and HiveMetaStore. Currently there is no way to use HiveMetaStoreClient and use iceberg. Any idea when will this be implemented?

[pvary]

@kesavkolla: This should not be that complicated. Currently I am focusing on other parts of the code, but if you want to try out yourself and contribute the code, I would be happy to review your change.

Thanks, Peter

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