feat:chain:splitstore chain prune (#9056)

* 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>

node/impl/full/chain.go

@@ -653,3 +653,14 @@ func (a *ChainAPI) ChainBlockstoreInfo(ctx context.Context) (map[string]interfac
 
 	return info.Info(), nil
 }
+
+func (a *ChainAPI) ChainPrune(ctx context.Context, opts api.PruneOpts) error {
+	pruner, ok := a.BaseBlockstore.(interface {
+		PruneChain(opts api.PruneOpts) error
+	})
+	if !ok {
+		return xerrors.Errorf("base blockstore does not support pruning (%T)", a.BaseBlockstore)
+	}
+
+	return pruner.PruneChain(opts)
+}