Rework Vector Set deletion and eviction

[kevin-montrose]

Rework Vector Set deletion and eviction to use GarnetRecordTriggers.

This matches how Range Indexes work, removes the BADSTATE possibility, gets a GUID comparison out of the hot path, and lays some groundwork for lots of Vector Sets.

Concretely:

• Switches Vector Set deletion detection to GarnetRecordTriggers.OnDispose, getting rid of all the cancelled Tsavorite op stuff
• Blocks on marking a context needs cleanup, removing all the partial deletion tracking logic
• Removes the GUID stuff for detecting index recreation, instead using the OnEvict and OnDiskRead callbacks in the same manner as Ranged Indexes
• Fixes RecordType handling during copy updates, fixing expiration

TODO:

• I'm not convince this approach cleanups up element data if we crash before marking - need to validate that
• Tests for expiration
• Update vector-sets.md with final delete design