[Remote Cluster State] Download the cluster state objects asynchronously and in parallel

[soosinha]

Is your feature request related to a problem? Please describe

Meta issue: #13683
Currently the remote cluster state objects are downloaded sequentially.

Describe the solution you'd like

Download the remote cluster state objects asynchronously so that the downloads can be parallelized.

Related component

Cluster Manager

Describe alternatives you've considered

No response

Additional context

No response

[peternied]

[Triage - attendees 1 2 3 4 5 6 7 8 9 10]
This issue doesn't have enough context to make a clear triage choice - deferring to the Cluster Manager team triage.

[soosinha]

#13924