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Problem: Currently `WriteState` "owns" the balancing state machine, even though a separate `DeleteState` can also trigger balancing, which results in awkward back-and-forth switching between `CursorState::Write` and `CursorState::Delete` during balancing. Fix: 1. Extract `balance_state` as a separate state machine, since its state transitions are exactly the same regardless of whether an insert or a delete triggered the balancing. 2. This allows to remove the different 'Balance-xxx' variants from `WriteState`, as well as removing `WriteInfo` and `DeleteInfo`, as those states become just simple enums now. Each of them now has a state called `Balancing` which just delegates work to the balancing state machine. 3. This further allows us to remove the awkward switching between `CursorState::Delete` and `CursorState::Write` during a balance that happens as a result of a deletion.