Merge-ready protocol (rc1)

The following LIPs are implemented:

• LIP-6: In-protocol coverage application mechanism ❤️‍🔥
• LIP-7: Composite oracle beacon report receiver 🔢
• LIP-8: Increase keysOpIndex in assignNextSigningKeys 🔑
• LIP-9: Add an explicit log for the stETH burn events 🧾
• LIP-10: Proxy initializations and LidoOracle upgrade ⬆️
• LIP-11: Add a transfer shares function for stETH 🧷
• LIP-12: On-chain part of the rewards distribution after the Merge 💰
• LIP-14: Protocol safeguards. Staking rate limiting 🦺
• LIP-15: Protocol safeguards. Resume role 🏃

Context

• Announcement on the Lido research forum
• Snapshot vote
• Twitter announcements 🐦