When a given bucket is eligible to receive more measurements, but we are about to close it e.g. due to memory pressure or out-of-order inserts, we should instead archive it. We will need to create a new list of archived buckets in BucketCatalog::Stripe, where we will retain the hash of the BucketKey and the bucket's _id value.

We will need to keep track of the archived list's memory usage.