ICS ?: IBFT 2.0 client support

[bluele]

Hi there.

We propose the spec of IBC Client that supports the IBFT 2.0 consensus protocol.

IBFT 2.0 is one of the major consensus protocols for Hyperledger Besu.

We believe that supporting Hyperledger Besu(IBFT 2.0), a popular blockchain in the enterprise blockchain space, will be valuable in expanding Cosmos IBC ecosystem.

The IBFT 2.0 Light Client spec can be found here, and an example implementation under development can be found here.

We will open a PR for the spec soon.

[bluele]

Hi @cwgoes, We've already opened a PR(#561) for this spec. Could we get a review from someone? Or please let us know if any other process is needed for ICS proposal.

[cwgoes]

Hi @bluele - thanks for the PR! We will try to take a look at it soon.

[crodriguezvega]

@bluele Is this issue still relevant?