feat(kadena-cli): refactor account code to a service

[barthuijgen]

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Test scenarios

• description of the (manually) executed test scenarios

Reminders (if applicable)

• I ran pnpm changeset in the root of the monorepo
• Test coverage has not decreased
• Docs have been updated to reflect changes in PR (don't forget
  docs.kadena.io)
• I ran pnpm install and pnpm test in the root of the monorepo
  (optionally with --filter=...package... to exclude non-affected
  projects)

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