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c602ac07e7
This commit moves the `HeightHintCache` implementation to the `channeldb` package and inverts the dependency relation between `chainntnfs` and `channeldb`. Many packages depend on channeldb for type definitions, interfaces, etc. `chainntnfs` is an example of that. `chainntnfs` defines the `SpendHintCache` and `ConfirmHintCache` interfaces but it also implments them (`HeightHintCache` struct). The implementation uses logic that should not leak from channeldb (ex: bucket paths). This makes our code highly coupled + it would not allow us to use any of these interfaces in a package that is imported by `channeldb` (circular dependency).