feat(#2243): add epochParams and ada holder balance to Proposal pillar

[MSzalowski]

List of changes

• add epochParams and ada holder balance to Proposal pillar

New properties passed to PDF:

          <ProposalDiscussion
            pdfApiUrl={import.meta.env.VITE_PDF_API_URL}
            walletAPI={{
              ...context,
              ...walletApi,
              createGovernanceActionJsonLD,
              createHash,
              voter,
            }}
            pathname={window.location.pathname}
            validateMetadata={
              validateMetadata as ComponentProps<
                typeof ProposalDiscussion
              >["validateMetadata"]
            }
            fetchDRepVotingPowerList={fetchDRepVotingPowerList}
            // New properties passed
            epochParams={epochParams}
            votingPower={votingPower}
          />

Checklist

• 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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