1. Implement a pass-through for garbage collection on the idstore.
2. Fix the `lotus-shed state-prune` command.
NOTE: the new performance of running a full prune will be significantly
less as this version doesn't batch. However, it should now actually
_work_ and most users will be using the splitstore anyways.
* Splitstore chain prune
* Protect on reification for simpler logic and sound cold compact protect
* Recovery from checkpoint during chain prune
* Splitstore (discard and universal mode) running in itests
* Add pause and restart functions to itest block miner
* Add config options to itest full nodes
* Add FsRepo support for itest full ndoes
Co-authored-by: zenground0 <ZenGround0@users.noreply.github.com>
