Add client spec for NEAR protocol (ICS 012)

[riversyang]

Octopus Network defines a new client spec for NEAR protocol. We pick ICS 012 as the number for this spec.

The minimal implementation of verification algorithm and a sample application for testing is here.

[crodriguezvega]

Thanks very much, @riversyang, for writing this spec, and sorry for the late review.

I have left a bunch of comments, many of them are for consistency with the other specs. Le me know what you think!

[riversyang]

Thanks very much, @riversyang, for writing this spec, and sorry for the late review.

I have left a bunch of comments, many of them are for consistency with the other specs. Le me know what you think!

Hi @crodriguezvega, many thanks for the detailed review! I have done a commit to update the doc. When you are available, please check again. Thank you!

[crodriguezvega]

Thank you for addressing all my comments, @riversyang. I just left one follow up comment here. And apologies again for the late reply.

I have also a question: are you planning to work also in the implementation of this light client? And if yes, in what language?

[riversyang]

Thank you for addressing all my comments, @riversyang. I just left one follow up comment here. And apologies again for the late reply.

I have also a question: are you planning to work also in the implementation of this light client? And if yes, in what language?

Yes, Octopus Network do have a plan to implement a fully functional ICS-012 client with Rust, which can be integrated in ibc-rs. But the schedule has not been decided yet.