Maintenance: Expire Snapshots Action

[cmcarthur]

Is your feature request related to a problem or challenge?

Implement an ExpireSnapshotsAction with similar configuration options and outputs to the Spark expire snapshots procedure. Part of #1453.

Describe the solution you'd like

An expire snapshots action that takes the following inputs:

• older_than_ms: A timestamp in milliseconds, specifying the retention window for snapshots
• retain_last: Minimum number of snapshots to retain
• max_concurrent_deletes: Maximum number of concurrent file deletions
• snapshot_ids: A specific list of snapshot IDs to expire
• dry_run: A flag allowing a preview of snapshot expiry

It is important that this action both write a new metadata version with snapshots expired, and followup and delete any now-unreferenced files. This will keep both the latest metadata and the metadata directory clean.

Willingness to contribute

I can contribute to this feature independently