Add training wheels mechanisms

[invocamanman]

• GlobalExitRootManager

  • Erase lastGlobalExitRootNum
  • Now in the globalExitRootMap stores the current timestamp instead
  • This timestamp will be used by the bridge by a protection bootstrap mechanism ( claimTimeout)
  • If the root does not change, DO NOT update the timestamp and neither emit event of update

• Bridge

  • Update the clones method, now with create2 ( for saving 2600 of gas in every call, also seems more clear the SC verification on blockscout), FE 🔴 should be aware of this, the way that the precalculatedWrapperAddress works change a little bit and depend on the name, symbol and decimals ( they already agree that this is fine tho)
  • Added claimTimeout
    • Once claim is call will check that the globalExtiRoot of that claim exist and at least claimTimeout seconds has passed since that global exit root was submitted
  • Add owner that is able to update the claimTimeout
  • Add emergencyMode
    • Stops all bridges and claims once activated
    • Only can be activate i deactivated by PoE contract

• PoE

  • Add emergencyMode
    • Can be activated by a owner ( bootstrap mechanism) or by call proofDifferentState succesfully
    • Stop forcedBatches, sequenceBatches, sequenceForcedBatches and verifyBatches functions
    • Only can be stopped by securityCouncil Address
    • Once activate/deactivated also actives/deactives the bridge one emergency one!

• Summary of training wheels mechanism;

  • Bridge owner can basically stops the claims on the bridge ( setting the claimTimeout to max)
  • PoE owner can basically stops both contracts ( activating the emergencyMode)
  • Security council can only interact once emergency mode is active
  • The idea is to remove in some point both ownership's of the contracts
  • Once removed, the only way to go emergency mode is to proof a different state
    • But this means that if there's a bug in the rom that can be exploited to subtract tokens/ether we cannot do anything about it!

• Update related tests and deployment scripts

• Add create genesis script

TODO:

• Create a timelock that will be the proxyManager of all contracts, and reduce the update time if the emergencyMode is active
  This was intended to be in this PR but i didint have time sorry xD

[krlosMata]

😸