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This PR implement the following discussion: https://leanprover.zulipchat.com/#narrow/channel/113488-general/topic/REPL.20garbage.20collection.20or.20fast.20pickleload/near/525339571
To be short, a new command
{"removeProofState": PROOF_STATE_ID}
is added, to remove proofStates that will not be used anymore to save the memory.Notice that after this PR,
proofStates : Array (Option ProofSnapshot) := #[]
. This may affect future designing of other functions.