Support for agoric.swingset.CoreEvalProposal in cosmos.gov.v1.MsgSubmitProposal

[mhofman]

What is the Problem Being Solved?

Cosmos 0.46 introduced a new governance module which supports multiple messages. However it looks like only chain software upgrade messages and normal tx messages are supported, but not the agoric.swingset.CoreEvalProposal message type that is available in the legacy v1beta1 governance module.

Description of the Design

Register CoreEvalProposal such that the governance module will process these messages.

At the same time, update the CLI to support generating a governance proposal with multiple CoreEvalProposal messages embedded. See #9841

Security Considerations

CoreEvalProposal messages must not be valid in normal tx messages. Only a governance proposal can execute these.

Scaling Considerations

None

Test Plan

a3p integration acceptance test submitting multiple core eval messages in the same governance proposal, some containing multiple core eval scripts.

Upgrade Considerations

Requires a new chain software