Extract Power Actor Claimed Power HAMT

[frrist]

Description

The power actors state maintains a map (HAMT) of miner addresses to claimed power. Extracting the state of the Claimed HAMT will yield information on the power of every miner on the network.

Acceptance criteria

• Extract the state of the claimed power hamt to a table power_actor_claims.
  e.g.

type PowerActorClaim struct {
	Height          int64  `pg:",pk,notnull,use_zero"`
	StateRoot       string `pg:",pk,notnull"`
	MinerID         string `pg:",notnull"`
	RawBytePower    string `pg:",notnull"`
	QualityAdjPower string `pg:",notnull"`
}

Where to begin

• Will require an addition to the lotus power shim for determining if the claimed hamt has changed. polish: add ClaimsChanged and DiffClaims method to power shim lotus#4628