Description

Closes: #XXXX

Use hash instead of strings as the keys in the quorumMap;
This improves memory usage as we are saving a constant amount of memory per key.

Author Checklist

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I have...

• read the contribution guide
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• targeted the main branch
• provided a link to the relevant issue or specification
• reviewed "Files changed" and left comments if necessary
• included the necessary unit and integration tests
• updated the relevant documentation or specification, including comments for documenting Go code
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• confirmed the correct type prefix in the PR title
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• reviewed state machine logic, API design and naming, documentation is accurate, tests and test coverage