Add support for excluding VMware snapshots based on snapshot name, prefix

[atc0005]

For example, some snapshots are created as part of a nightly backup process. In those cases large snapshot sizes are to be expected, but still trigger snapshot size alerts. If we support excluding based on name (fixed value) or a prefix (leading fixed value in name) those snapshot alerts would not trigger.

Example:

TSM-VM Snapshot Fri Mar 11 23:02:08 2022

[atc0005]

That said, it would probably be useful to support combining the exclusion with logic to ignore snapshots with an age less than X days. That way any snapshots ignored this way are not permanently ignored, just temporarily ignored for a time until the backup software can complete and then remove the snapshot.