Improve ConsensusService Code Coverage

[povolev15]

Add more unit tests to improve code coverage to each class in Consensus Service

1. Checked box without issue indicates False negative for coverage where codacy reports 0% coverage but test exists.
2. Checked box with Issue indicates the associated issue has been addressed.
3. List items in bold represent classes falling below 80% coverage and targeted for improvement

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CONSENSUS

• [ ] ConsensusServiceDefinition [0 %]

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CODEC

• [ ] ConsensusServiceStateTranslator [95 %]
• [ ] EntityNumCodec [83 %]

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HANDLERS

• [ ] ConsensusCreateTopicHandler [91%]
• [ ] ConsensusDeleteTopicHandler [86 %]
• [ ] ConsensusGetTopicInfoHandler [84 %]
• [ ] #13217
• [ ] #13209
• [ ] ConsensusUpdateTopicHandler [89 %]

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SCHEMAS

• [ ] InitialModServiceConsensusSchema [0%]

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BASE PACKAGE

• [ ] ConsensusServiceImpl [0%]
• [x] ReadableTopicStoreImpl [100 %]
• [x] WritableTopicStore [100 %]