integrate casper event toolkit: add unprocessed deposits to batch on deploy

[marijanp]

Things done:

• implemented and for a kairos-test-utils/cctl helper that deploys a given contract
  • added a basic test
  • adjusted the nixos module for cctl
• Added a contract hash argument to the kairos-cli deposit command
• Added a known deposit deploys set that is used to keep track of deposit deploys routed through our L2
• Updated the EventManager initialization to use retry and to initialize the next_deposit_index with the current on-chain state
• Added a SSE trigger to the L1Sync service that fetches new events when a notification for a known deploy is received

[koxu1996]

@marijanp We should refactor it together once #96 gets merged.