[augerctl] Support watch for get

[wzshiming]

part of #3

Test

Preparation cluster

Create a cluster and expose etcd port, to facilitate the creation of a cluster using kwokctl, this can be any other k8s cluster

# brew install kwok
kwokctl create cluster --etcd-port 2379

Watch leases changes

augerctl get leases -n kube-system -w

[k8s-ci-robot]

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[wzshiming]

/cc @jmhbnz
/cc @siyuanfoundation

[jmhbnz]

Hey @wzshiming - I'll review this one next, can you please rebase to fix conflicts, thanks! 🙏🏻

[wzshiming]

Done, thank you for reviewing it 😄

[jmhbnz]

Hey @wzshiming - General question, have you put any thought into potential approaches for writing tests for augerctl? To add new features it gets easier over time if we have tests to verify existing features don't break.

[wzshiming]

Sure, my original plan was to add the e2e test after the subcommand get.