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In this commit, we modify the incoming contest resolver to use a concurrent queue. This is meant to ensure that the invoice registry subscription loop never blocks. This change is meant to be minimal and implements option `5` as outlined here: https://github.com/lightningnetwork/lnd/issues/8023. With this change, the inner loop of the subscription dispatch method in the invoice registry will no longer block, as the concurrent queue uses a fixed buffer of a queue, then overflows into another queue when that gets full. Fixes https://github.com/lightningnetwork/lnd/issues/7917