Implement StateMinerRecoveries endpoint

[elmattic]

Summary of changes

Changes introduced in this pull request:

• Implement the StateMinerRecoveries RPC method.

| RPC Method                         | Forest | Lotus |
|------------------------------------|--------|-------|
| Filecoin.StateMinerRecoveries (47) | Valid  | Valid |

Reference issue to close (if applicable)

Part of #3639

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.