[littlegrasscao]

Summary

• add Delta Sharing GET /shares/{share}/schemas/{schema}/tables/{table}/version to OpenSharingProtocolService
• return an empty body with the required Delta-Table-Version response header
• core ProtocolTables.version finds the table among the share's included tables or the catalog children of a shared schema, resolving it as the share owner
• core DeltaKernel vends short-lived read credentials through CatalogConnector.getStorageCredentials as the share owner, configures Hadoop for AWS/R2, Azure, or GCP, and reads the table's _delta_log
• return the latest version when startingTimestamp is absent; for an ISO-8601 UTC startingTimestamp, return the earliest version at or after it
• report invalid/too-late timestamps as INVALID_PARAMETER_VALUE, and missing or ungranted objects as RESOURCE_DOES_NOT_EXIST
• local catalog: ENV credential mode for cloud integration tests; add runtime commons-lang3, which hadoop-aws needs and Spring no longer brings in
• CI passes Azure and GCS test credentials
• test support: TestServer.start(Properties) starts a server with overrides, and ProtocolApiSupport.restartServer replaces the default server with one on another catalog, closing it rather than leaking it

Testing

• mvn clean install: 144 tests passed
• ProtocolTableVersionTest reads real Delta logs written to a temp directory: latest, before the first commit, exact, between commits, after the latest, shared-schema children, invalid timestamp, missing table, ungranted share
• ProtocolTableVersionIntegrationTest ran against the AWS, Azure, and GCS test tables (each case is skipped without its credentials)

Stacked on #103.