[Remote Store] Add support to auto restore data from remote store

[sachinpkale]

Describe the solution you'd like
In case of red index where no valid copy of the shard exists, the auto-restore flow will download translog and segments from the remote store.

[mashah]

I can also help with this one. Let's discuss.

[sachinpkale]

Sure @mashah . Auto restore would really add a value to the durability feature we want to build with the remote store.