Add tests for creating public key with no known private key

[heifner]

Change Description

• Demonstrate creating a public key directly from a hash with no known private key.
• public key with no known private key: EOS5JU1RRZkMdzuRFubAXFasH2WfvPdJ8fKesxfJgh1dhcmkUfuw5Y

Change Type

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• Documentation

• Stability bug fix

• Other

• Other - special case

Testing Changes

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• New Tests

• Existing Tests

• Test Framework

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Consensus Changes

• Consensus Changes

API Changes

• API Changes

Documentation Additions

• Documentation Additions