CLI: Add a lotus multisig cancel command

[arajasek]

No description provided.

[codecov]

Codecov Report

Merging #7645 (32fc038) into master (ef0771e) will decrease coverage by 0.13%.
The diff coverage is 1.25%.

@@            Coverage Diff             @@
##           master    #7645      +/-   ##
==========================================
- Coverage   39.77%   39.64%   -0.14%     
==========================================
  Files         633      633              
  Lines       67263    67337      +74     
==========================================
- Hits        26757    26696      -61     
- Misses      35911    36031     +120     
- Partials     4595     4610      +15     

Impacted Files	Coverage Δ
api/api_full.go	47.36% <ø> (ø)
api/v0api/v1_wrapper.go	2.22% <0.00%> (ø)
node/impl/full/multisig.go	33.55% <0.00%> (-0.45%)	⬇️
cli/multisig.go	12.62% <1.35%> (-0.94%)	⬇️
chain/events/message_cache.go	87.50% <0.00%> (-12.50%)	⬇️
storage/wdpost_sched.go	77.45% <0.00%> (-9.81%)	⬇️
extern/sector-storage/worker_tracked.go	76.53% <0.00%> (-8.17%)	⬇️
chain/events/observer.go	71.64% <0.00%> (-6.72%)	⬇️
miner/miner.go	51.65% <0.00%> (-4.31%)	⬇️
chain/exchange/peer_tracker.go	66.66% <0.00%> (-4.31%)	⬇️
... and 14 more

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[arajasek]

Manually tested, does the thing