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Introduce SqlSubscriptionLookup

Authored by daniel.

Description

Introduce SqlSubscriptionLookup

This also introduces DualSubscriptionLookup that allows
subscriptions to be looked up in the subscription table
as well as the sitelink table, to allow incremental migration
of client wikis.

NOTE: this patch does not yet hook up the new classes to be used.

Bug: T66590
Bug: T90755
Change-Id: I239420457100b5565c132048bf57b64f7f304d56

Details