Amino support for x/authz & x/feegrant

[amaury1093]

Summary

Should we add amino support for x/authz and x/feegrant Msgs ?

Problem

The current state of x/authz and x/feegrant is that their Msgs don't support legacy amino JSON signing.

The reasons for this were primarily:

• they are new modules created after Stargate, where amino has been declared legacy.
• authz's initial design was based on ADR-031 ServiceMsgs (but this design has since been changed, see ADR-031: reconsider type url format for service msgs encoded as google.Protobuf.Any #9063).

So whereas the SDK as a whole still supports legacy amino JSON, some modules inside it don't. Ledger users won't be able to sign authz and feegrant Msgs.

Proposals

Either we fully support amino:
+ Ledger support
- more legacy code lying around

Or we fully document which modules in the SDK support legacy amino, and which don't
+ Less code change needed, v0.43 will be out sooner
- no ledger support

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[tac0turtle]

I think more and more modules are being written with no amino. I have written a few that has removed or not added amino at all. I think saying the same for new modules makes sense.

We should just expedite the sign mode that fixes it

[aaronc]

I think we should add for now but I also think we should expedite sign mode textual.

[amaury1093]

I'll take this issue.