[littlegrasscao]

Summary

• add Delta Sharing POST /shares/{share}/schemas/{schema}/tables/{table}/query to OpenSharingProtocolService, as parquet or delta NDJSON with the version in Delta-Table-Version
• read the latest snapshot, or one at a version or timestamp, through Kernel as the share owner; a historical query reports the version on metaData and every file
• presign every data file and on-disk deletion vector with UrlSigners for an hour, or until the catalog credentials expire if sooner; there is no URL lifetime or URL access setting, and tables need the url access mode
• the fileidhash header picks MD5 or SHA-256 file ids and is echoed back
• delta responses require the reader features the table declares; parquet cannot read a table that has any
• the body is optional; predicate and limit hints and startingVersion/endingVersion are not implemented

Testing

• mvn clean install: 181 tests passed
• ProtocolTableQueryTest: latest, version, and timestamp queries on a local Delta log with no data files, both response formats, fileidhash, no body, invalid parameters, ungranted share
• ProtocolTableQueryIntegrationTest: signed S3, Azure, and GCS file URLs, a schema grant, and deletion vector signing on the cloud test tables; each case is skipped without credentials
• TableActionsTest, FileIdHashTest, DeltaSharingCapabilitiesTest cover file actions, ids, and reader features

Stacked on #108.