feat(agoric-cli): proposeChangeMintLimit

[dckc]

refs: #6108

Description

add an agops psm proposeChangeMintLimit command.

Security Considerations

can't think of any; this just makes things that were previously possible somewhat easier.

Documentation Considerations

Notes on using proposePauseOffers are added to
https://github.com/Agoric/agoric-sdk/blob/master/packages/agoric-cli/test/agops-governance-smoketest.sh

This is purely a client; no chain-side changes to prompt upgrade considerations.

Testing Considerations

tested manually as far as seeing the question posted:

agoric follow :published.committees.Initial_Economic_Committee.latestQuestion

``` $ agoric follow :published.committees.Initial_Economic_Committee.latestQuestion { closingRule: { deadline: 1663627279n, timer: slot(0,"Alleged: timerService"), }, counterInstance: slot(1,"Alleged: InstanceHandle"), electionType: "param_change", issue: { contract: slot(2,"Alleged: InstanceHandle"), spec: { changes: { MintLimit: { brand: slot(3,"Alleged: IST brand"), value: 10000000000n, }, }, paramPath: { key: "governedApi", }, }, }, maxChoices: 1, method: "unranked", positions: [ { changes: { MintLimit: { brand: slot(3), value: 10000000000n, }, }, }, { noChange: [ "MintLimit", ], }, ], questionHandle: slot(4,"Alleged: QuestionHandle"), quorumRule: "majority", tieOutcome: { noChange: [ "MintLimit", ], }, } ```

[turadg]

Code LGTM. I'd suggest putting your new docs in the smoketest shell script. I expect anyone using that file is running commands one-by-one and reading them so it doesn't hurt to have more cases covered.