v2 API: Missing `Send` bound for `RaftStateMachine::apply()` about openraft HOT 2 CLOSED

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from openraft.

The same is true for RaftLogStorage::append(). It should probably also have a bound on the iterator like this:

    async fn append<I>(&mut self, entries: I, callback: LogFlushed<C::NodeId>) -> Result<(), StorageError<C::NodeId>>
    where
        I: IntoIterator<Item = C::Entry> + Send,
        I::IntoIter: Send;

from openraft.