[littlegrasscao]

Summary

• add GET /shares/{share}/schemas/{schema}/tables and GET /shares/{share}/all-tables to OpenSharingProtocolService
• core ProtocolTables lists the share's included tables plus the catalog children of each schema shared as a whole, ordered by schema and then name
• every catalog call (resolveAsset, listChildren) is made as the share owner, so the catalog decides whether the owner may still read each table; included tables are resolved only when they land on the requested page
• use the catalog table id and accessModes url,dir for managed and external Delta tables
• report a missing or ungranted share, or unknown schema, as RESOURCE_DOES_NOT_EXIST
• reuse bounded maxResults / opaque pageToken pagination, where maxResults=0 returns no items with a token

Testing

• mvn clean install: 138 tests passed
• ProtocolTablesTest: lists the granted tables in a schema, the catalog children of a shared schema, and every table in a share, and pages tables in a schema, where maxResults=0 returns no tables but a token

Stacked on #102.