feat(dw): add sign requests for plugins

[javadkh2]

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Test scenarios

• description of the (manually) executed test scenarios

Reminders (if applicable)

• I ran pnpm install and pnpm test in the root of the monorepo
  (optionally with --filter=...package... to exclude non-affected
  projects)
• 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)

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Latest commit: 8fb5348

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