[META] Add timestamp pinning support in remote backed storage

[sachinpkale]

Please describe the end goal of this project

As part of shallow snapshot optimisations, we are introducing timestamp based implicit locking support. This feature will be called Timestamp Pinning in remote backed storage. When a timestamp is pinned, remote store garbage collectors will skip deleting data corresponding to the timestamp.

Supporting References

• [RFC] Simplified Snapshot v2 with Timestamp Pinning in Remote Store #15057

Issues

• [Timestamp Pinning] Finalise approach on communicating updated pinned timestamp to nodes in the cluster #15060
• [Timestamp Pinning in Remote Store] Pinned timestamp service to pin/unpin timestamp #15061
• [Timestamp Pinning in Remote Store] Scheduler to fetch pinned timestamp list from remote store #15062
• [Timestamp Pinning in Remote Store] Remote segment store garbage collection changes #15063
• [Timestamp Pinning in Remote Store] Remote translog garbage collection changes #15064
• [Timestamp Pinning in Remote Store] Changes in remote store restore flow to restore data at given timestamp #15066
• Make RemoteStorePinnedTimestampService a AbstractLifecycleComponent #15243
• Make number of pinned_timestamp files to keep in remote configurable. #15248

Related component

Storage:Remote