Shed: Add a util to create miners more easily

[arajasek]

No description provided.

[codecov]

Codecov Report

Merging #7595 (3be0c06) into master (e0a9cae) will decrease coverage by 0.14%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #7595      +/-   ##
==========================================
- Coverage   39.88%   39.74%   -0.15%     
==========================================
  Files         633      633              
  Lines       67098    67214     +116     
==========================================
- Hits        26765    26711      -54     
- Misses      35740    35898     +158     
- Partials     4593     4605      +12     

Impacted Files	Coverage Δ
chain/actors/builtin/miner/utils.go	38.59% <0.00%> (-12.57%)	⬇️
cmd/lotus-miner/init.go	0.00% <0.00%> (ø)
cmd/lotus-shed/miner.go	0.00% <0.00%> (ø)
chain/events/message_cache.go	87.50% <0.00%> (-12.50%)	⬇️
markets/loggers/loggers.go	89.28% <0.00%> (-10.72%)	⬇️
chain/stmgr/call.go	67.87% <0.00%> (-7.28%)	⬇️
chain/events/observer.go	71.64% <0.00%> (-6.72%)	⬇️
chain/stmgr/execute.go	86.95% <0.00%> (-4.35%)	⬇️
chain/exchange/peer_tracker.go	66.66% <0.00%> (-4.31%)	⬇️
node/hello/hello.go	63.63% <0.00%> (-3.41%)	⬇️
... and 22 more

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[jennijuju]

is there a reason why this is a hiding shed tool?