Implement TryAsRef<ForwardToLeader<..>> for RaftError

[HaHa421]

Is your feature request related to a problem? Please describe.
this eases client implementation

Describe the solution you'd like
merged and backported

Describe alternatives you've considered
None

Additional context

impl<NID, N , E> TryAsRef<ForwardToLeader<NID, N>> for RaftError<NID, E>
where
    NID: NodeId,
    N: Node,
    E: Debug + TryAsRef<ForwardToLeader<NID, N>>,
{
    fn try_as_ref(&self) -> Option<&ForwardToLeader<NID, N>> {
        self.forward_to_leader()
    }
}

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[drmingdrmer]

Make sense. Would you open a PR for it? :)

[drmingdrmer]

• Fixed in Feature: Implement TryAsRef<ForwardToLeader<..>> for RaftError #1088

Good job!