RPC provider methods tracking issue (pre-FVM)

[lemmih]

Issue summary

The following RPC methods are necessary to be compatible with the glif.io public RPC provider (pre-FVM).

• [ ] Filecoin.ChainGetNode
• [x] #4396
• [ ] Filecoin.ChainNotify - Implemented but hard to test.
• [ ] Filecoin.ChainPutObj
• [ ] Filecoin.Discover
• [ ] Filecoin.GasEstimateGasPremium
• [ ] Filecoin.GasEstimateMessageGas
• [ ] Filecoin.MinerGetBaseInfo - Implemented but flaky.
• [ ] Filecoin.MpoolGetNonce - Implemented but flaky on the Lotus side.
• [x] Filecoin.MsigGetVested
• [x] #4304
• [x] #4392
• [ ] Filecoin.StateDecodeParams - Difficult to implement.
• [x] #4189
• [x] #4303
• [x] Filecoin.StateReplay
• [x] Filecoin.StateSectorGetInfo
• [x] Filecoin.StateVerifierStatus #4319
• [x] #4166

Lotus documentation for the RPC methods: https://github.com/filecoin-project/lotus/blob/master/documentation/en/api-v1-unstable-methods.md

Other information and links