feat: add broadcasts.cancel() method (#1064)

[dielduarte]

Summary

• Cherry-picks ade6ecc (feat: add broadcasts.cancel() method #1064) from main into canary — it was accidentally merged to main instead of canary.
• Adds broadcasts.cancel() method, its interface, and tests.

Test plan

• npx vitest run src/broadcasts — 21 passed
• npx tsc --noEmit — clean

---

Summary by cubic

Adds broadcasts.cancel(id) to the resend SDK to cancel queued or scheduled broadcasts. Includes response types and tests; bumps version to 6.19.0.

• New Features
  • Added broadcasts.cancel(id) (POST /broadcasts/{id}/cancel).
  • Exported CancelBroadcastResponse types; tests cover success and 403 when not cancelable.

^{Written for commit 683dce5. Summary will update on new commits.}

[pkg-pr-new]

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npm i https://pkg.pr.new/resend@1065

commit: 683dce5