L1 state synchronization

[koxu1996]

• Build Rust library for working with Casper Event Standard - https://github.com/koxu1996/casper-event-toolkit.
• Implement simple SSE client - Casper Deploy Notifier #40.
• Integrate kairos-tx with smart contract events - Integrate kairos-tx with smart contract events #73. <- This will be discussed post-MVP.
• Integrate CES library with Kairos server - Periodic L1 synchronization #96.
• Integrate SSE trigger - WIP ⚙️ .