feat(shed): miner locked-vested, and miner list-vested <miner>

[rvagg]

Ref: filecoin-project/builtin-actors#1594

Current output:

Scanning actors (looking for v24 miners [bafk2bzacecnl2hqe3nozwo7al7kdznqgdrv2hbbbmpcbcwzh3yl4trog433hc] at epoch 4616980)............................................................................................................................................................................................................................................................................................................................................
Total actors: 3320119
Total miners: 686515
Miners with locked funds: 2073
Total locked funds: 355780.058629719966731966 FIL

[rvagg]

@ZenGround0 this is probably overcounting because it's comparing to now but the unlocking only happens on deadline tick. Maybe it should count from WPoStProvingPeriod less than now?

[rvagg]

If I do that, the number of miners reduces but the total FIL is still large, which makes sense since we're just discounting funds that are about to vest:

Total actors: 3320124
Total miners: 686518
Miners with locked funds: 1530
Total locked funds: 342826.386784283280495497 FIL

[ZenGround0]

It would be useful to have an additional command that dumps the vesting table of a given miner if you're in the mood to add that here. But either way it will now be easy to build that with this as an example.

[rvagg]

@ZenGround0 good idea, done in this PR (change title to match). I also put a "stale epoch" of now minus one deadline, which I think matches how cron works—if it hasn't cleared by then, then it's probably not going to clear. Can you have a look at this logic? Maybe I should -1 from this too?

Total actors: 3320186
Total miners: 2026
Miners with locked vested funds: 2026
Total locked vested funds: 355059.650786527951408884 FIL

It can also list miners and the miners in this list and the amount locked. The largest is f01825045 with 11797, and he's relatively old, from 3956678 to 4463558 where it stops.