R4R: add-genesis-account: validate app state accounts

[alessio]

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
• Wrote tests
• Updated relevant documentation (docs/)
• Added entries in PENDING.md with issue #
• rereviewed Files changed in the github PR explorer

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@9a37066). Click here to learn what that means.
The diff coverage is 88.88%.

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[alexanderbez]

LGTM. Simple, clean and minimal. Although I can see the check getting expensive if there is a ton of accounts?

[alessio]

True that @alexanderbez, still this is a command line utility that serves to purpose of preparing genesis.json for further processing by collect-gentxs. Thus I guess performance should not be a big concern here.

[cwgoes]

ACK