feat(#3277): handle drep voting power list on frontend

[MSzalowski]

List of changes

• handle drep voting power list on frontend

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• related issue
• My changes generate no new warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the changelog
• I have added tests that prove my fix is effective or that my feature works

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[MSzalowski]

@nebojsact So the API call on the pdf level should be pretty simple. I am passing the fetchDRepVotingPowerList into the PDF and the only thing you need to do is execute it as such:

const result = await fetchDRepVotingPowerList(["identifier1", "identifier2"])

As a result, you'll have an array of dreps that were found for the provided identifiers, their view, encoded hash, votingPower and givenName.

givenName can be null if it does not exist.

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