[WIP] Add Rebasable token to Optimism

[kovalgek]

WHAT

Implement a new rebasable token on Optimism

HOW

• add new token
• change L1 and L2 bridges to support new token flows.
• add token rate oracle for storing rate on L2
• add token updater for emergency flow Detailed schemes and explanation you can find here https://hackmd.io/@lido/ryKP1ssm6

TODO

• [x] Rebasable Token
  • [x] implementation
  • [x] unit tests
• [x] Token Rate Oracle
  • [x] implementation
  • [x] unit tests
• [x] L1Bridge
  • [x] implementation
  • [x] unit tests
• [x] L2Bridge
  • [x] implementation
  • [x] unit tests
• [x] Deploy scripts
• [x] Integration tests
• [x] E2E tests
• [ ] gas tests