feat: allow canister http transform of another canister #4800
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This PR relaxes the restriction that the canister http transform method must be exposed by the same canister that makes the canister http outcall: a canister http transform of any canister on the same subnet can be used instead.
This PR also renames
QuerySource::Anonymous
toQuerySource::System
since the caller of such a query is the management canister (rather than the anonymous principal) and queries with such a source are triggered by the protocol (system) for canister http outcalls.