command options: Add dumpgenesis command

[hyochan-brown]

Proposed changes

Enhance ethereum compability (PR)

• Add dumpgenesis command. (Dumps genesis block JSON configuration to stdout)

ken dumpgenesis --baobab
{"config":{"chainId":1001,"istanbul": ...}, "timestamp":"0x5d132648","extraData":"...","governanceData":...,"blockScore":...,"alloc":...,"number":"0x0","gasUsed":"0x0","parentHash":"0x0000000000000000000000000000000000000000000000000000000000000000"}

Types of changes

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• Bugfix
• New feature or enhancement
• Others

Checklist

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• I have read the CONTRIBUTING GUIDELINES doc
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• Lint and unit tests pass locally with my changes ($ make test)
• I have added tests that prove my fix is effective or that my feature works
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• Any dependent changes have been merged and published in downstream modules

[aidan-kwon]

@hyochan-brown Please merge this PR if you finish all conversations above.