Prerelease v2.0.0-rc.4

What's Changed

• Add Erigon by @unxnn in #32
• docker-compose refactoring by @unxnn in #33
• Oracles V2 by @tsudmi in #24
• Update images for oracle, keeper, subgraphs by @tsudmi in #34
• Refactor operator onboarding by @tsudmi in #35
• Fix validator registration query by @tsudmi in #36
• Fix not synced eth block by @tsudmi in #37

Full Changelog: v1.4.2...v2.0.0-rc.4