Chore: update anchor support #12
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Unfortunately BDK's current wallet design requires us to have it live in `Mutex` that is locked for long periods of time during syncing. This is especially painful for short-lived operations that just operate locally, such as retrieving the current balance, which we now do in several places to be able to check Anchor channels limitations, e.g., in event handling. In order to avoid blocking during balance retrieval, we introduce a `balance` cache that will be refreshed whenever we're done with syncing *or* when we can successfully get the wallet lock. Otherwise, we'll just return the cached value, allowing us to make progress even though a background sync of the wallet might be in-progress.
…chore/update-anchor-support
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fixes possible freeze when opening an anchor channel