add peek support

[web3creator]

Is your feature request related to a problem? Please describe.
add

// peek_with_async().await
pub async fn peek_with_async(&self)->result<(),error>;
// loop {sleep(internal)}
pub  fn peek(&self)->result<(),error>;

Describe the solution you'd like
Node and master node remain synchronized

Describe alternatives you've considered
The underlying framework determines whether the current node and the master node are synchronized with the master node at this moment.

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[AdamLeyshon]

Isn't that what ensure_linearizable is for?

If I understand it right, this function ensures that the node is up to date with Raft logs?

[drmingdrmer]

Isn't that what ensure_linearizable is for?

If I understand it right, this function ensures that the node is up to date with Raft logs?

Yes It looks like peek() is just forward ensure_linearizable to leader on the follower.