v4.0.0-rc4

Changelog

• b0f41ea chore!: remove DefaultInitialVersion (celestiaorg#4766)
• 814f523 fix: celestia-appd init creates a genesis.json with latest app version (celestiaorg#4771)
• 1a88b78 fix: ensure core block api runs through multilplexer native app (celestiaorg#4767)
• ccef5e9 fix: use standard appDirectory where applicable (celestiaorg#4760)
• b8c1db4 test(scripts): add missing genesis (celestiaorg#4764)