Add chain-level filtering for CrossChain queries

[ljoss17]

Summary

Hermes version v1.9.0 doesn't apply any filtering to CrossChain queries, https://github.com/informalsystems/hermes/blob/master/crates/relayer/src/supervisor.rs#L383.
This can cause the relayer to try to relay CCQ to chains which aren't configured.

Proposal

Verify if the destination chain of a CrossChain query is configured, if not discard the query.

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