We want to make the execution trace cache size configurable as SPs
may want to disable it while exchanges may want to crank it up.
We were also are going with intuition for this value, so having
ability to change it without a new build would help.
Fixes: https://github.com/filecoin-project/lotus/issues/10584
This PR adds a small cache to calls to ExecutionTrace which helps
improve performance for node operators like exchanges and block
explorers.
If items is in cache calls to this function will be 2-3x faster.
Fixes: https://github.com/filecoin-project/lotus/issues/10504
