[ENH] - Make environment usage metrics available

[Adam-D-Lewis]

Feature description

In conda store in practice, I've seen environments often build up over time taking more and more storage. Sometimes that's desired (e.g. reproducibility), sometimes it's not. It would be nice to be able to see the last time an environment was used as a candidate for cleanup. Possibly, metrics around the last time a prior environment version was set to active might be a useful metric to consider for which environments to delete.

Value and/or benefit

Help storage space conscious users clean up old environments based on relevant metrics.

Anything else?

No response