Implement a lite mode of GC that can be tested on CI and can be triggered with forest-cli

[hanabi1224]

Summary

The current full mark-and-sweep GC requires waiting thus cannot be tested on CI or be triggered with forest-cli. As discussed with @lemmih , it should be feasible to implement another lite mark-and-sweep GC by slightly modifying the current full GC

Completion Criteria

• implement lite mark-and-sweep GC
• implement forest-cli command to trigger lite GC
• run / test the lite GC on CI
• implement a scheduling policy to allow lite and full GC work together with no conflict

Additional Links & Resources