[feature request]add HubLeaderElection Controller in yurt-manager component.

[rambohe-ch]

What would you like to be added:
According to the following proposal, A new controller named HubLeaderElection should be added for electing a leader Yurthub in a nodepool according to election strategy.

• only elect a leader Yurthub for nodepool which field interConnectivity is true.
• write address of leader Yurthub into NodePool status.LeaderEndpoints.
• update NodePool status.conditions according to Leader Election results.

https://github.com/openyurtio/openyurt/blob/master/docs/proposals/20241211-reuse-nodepool-list-watch-requests.md#reuse-listwatch-requests-in-nodepool

others
/kind feature

[tnsimon]

/assign @tnsimon