Remove `Backend::destroy_state` (#5068)
* Remove `Backend::destroy_state` This removes the `destroy_state` function of `Backend` and instead moves the functionality into the `Drop` implementation of the state. This makes it much easier to work with the state, as the user no longer needs to call` destroy_state` manually. However, it requires that we switch from `RwLock` to `ReentrantMutex` as while importing a block we maybe need to lock again in `drop`. * Bring back the `RwLock` and some other clean ups * Fix compilation
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bb1b68d2
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