feat: FVM: Support exectraces

[arajasek]

Related Issues

Updates to FFI master, FVM 0.7.1.

Allows generation of execution traces from the FVM, using the LOTUS_VM_ENABLE_GAS_TRACING_VERY_SLOW envvar. We should rename this variable assuming it won't break existing setups, ideally making it a runtime flag that we can choose.

The only fields that we are "losing" from the execution traces produced by the Legacy VM are the Duration and GasCharges fields. I'm hoping that neither of these are too critical, but we can (partially) add them later.

Proposed Changes

Additional Info

Checklist

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[arajasek]

Need to pull this into feat/nv16 as well

[codecov]

Codecov Report

Merging #8514 (36a8d97) into master (1922e76) will decrease coverage by 0.08%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #8514      +/-   ##
==========================================
- Coverage   40.77%   40.69%   -0.09%     
==========================================
  Files         686      686              
  Lines       75501    75522      +21     
==========================================
- Hits        30787    30732      -55     
- Misses      39403    39467      +64     
- Partials     5311     5323      +12     

Impacted Files	Coverage Δ
chain/vm/fvm.go	0.00% <0.00%> (ø)
chain/vm/runtime.go	53.17% <0.00%> (ø)
chain/vm/vm.go	61.63% <0.00%> (-1.07%)	⬇️
chain/stmgr/call.go	65.94% <0.00%> (-6.49%)	⬇️
chain/events/observer.go	73.79% <0.00%> (-6.21%)	⬇️
storage/wdpost_sched.go	75.49% <0.00%> (-5.89%)	⬇️
chain/sub/incoming.go	59.02% <0.00%> (-2.45%)	⬇️
miner/miner.go	57.04% <0.00%> (-2.30%)	⬇️
extern/sector-storage/sched.go	84.41% <0.00%> (-1.53%)	⬇️
lib/rpcenc/reader.go	70.29% <0.00%> (-1.49%)	⬇️
... and 12 more

[jennijuju]

(leaving a comment for future me: we are disabling this by default for security consideration for future user actors, to avoid bad details traces getting accumulated on the node)