light client: Canonical Rollapp Light Client Integrity - Impl

[omritoptix]

based on: 1.https://www.notion.so/dymension/Rollapp-Light-Client-Validity-Vanilla-TrustPeriod-42c84ea2e9fd4b67a53f3636f7ec5687?pvs=4

2. https://www.notion.so/dymension/Light-client-rollback-dd9984a42252487bb812c058893c777f?pvs=4
3. https://www.notion.so/dymension/Rollapp-IBC-Light-Client-Validity-Comparison-2ec0cafcb09d41268e6306304a50abef?pvs=4

[danwt]

Gonna note some things here to not lose track.

• [ ] ADR needs a fleshed out section on backwards compatibility and upgrades. There is already a research section on this but needs to go in ADR too. In particular
  • [ ] Explanation of complete upgrade flow bearing in mind Hub upgrades first, then the rollapps and rollapps can upgrade all at different times and at their own pace
  • [ ] Description of state migration, or argument that none are needed
  • [ ] Any additional logic needed to make sure things go smoothly
• [ ] Make sure canonical channel is also set properly (kinda out of scope)
• [ ] Investigate canonical client and channel on the rollapp (out of scope)
• [ ] Make sure relayer can handle non adjacent next validator hash change

[danwt]

Another thing in addition to the above:

• [ ] need to make sure relayer can actually create canonical client in normal operation