Add support for cosmos sdk v0.47 updates

[ryanchristo]

Two new required fields have been added to MsgSubmitProposal in cosmos sdk v0.47 - title and summary (link). Given the intention to support multiple chains, ideally we would support both v0.46 and v0.47.

This would most likely require updating @regen-network/api to the latest proto files, which are non-breaking API changes, and maybe adding additional information to chain info that specifies which sdk version is being used and handling accordingly.

This feature was proposed in conversation with @gjermundgaraba.

[gjermundgaraba]

We are starting to work on the groups UI from our end, but figuring out this one, in particular, would go a long way to make sure we make changes that are "upstreamable".

Is the proposed solution of updating @regen-network/api something that can be done in a reasonable amount of time, or do you have other ideas in mind on how to solve this?

[ryanchristo]

Updating the api package should be pretty straightforward. We'll need to test though and make sure it's backwards compatible, i.e. a chain running v0.46 can use the v0.47 api without any issues.

[ryanchristo]

I've created an issue in the regen-js repository to track: regen-network/regen-js#76