Plugin: plumb down install/restore context

[dtivel]

One of the core problems in current plugin design is that the protocol layer (NuGet.Protocol) lacks context on the overall install/restore operation.

1. Plugin's are not promptly terminated when an operation is complete. Plugins are terminated when either of the following occurseither the NuGet process exits or after some idle time has passed.
2. Plugin-related resources (in NuGet) are retained after an operation is complete. These resources should be released as soon as the operation is complete.
3. Faulted plugins are restarted during the same operation. Within an operation, a plugin fault should fail the overall operation.

If some operation context is passed down from NuGet clients to the protocol layer, then the protocol layer can perform necessary cleanup on operation completion.

[ghost]

Due to lack of recent activity, this issue has been marked as a candidate for icebox cleanup. It will be closed if no further activity occurs within 14 more days. Any new comment (by anyone, not necessarily the author) will add a Triage:NeedsTriageDiscussion label and lead to a triaging process.
This process is part of the experimental Stale icebox issues cleanup we are currently trialing. Please share any feedback you might have in the linked issue.

[ghost]

This issue will now be closed since it had been marked Icebox cleanup candidate, but received no further activity in the past 14 days.