Implementasikan class CircuitBreaker sederhana:

• constructor(failureThreshold) — mulai di state "closed".
• recordSuccess() — reset failure counter ke 0; jika state "half-open" → kembali ke "closed".
• recordFailure() — tambah counter. Dari "closed": jika counter ≥ failureThreshold → pindah ke "open". Dari "half-open": langsung kembali ke "open".
• tryReset() — dipanggil setelah timeout; jika state "open" → pindah ke "half-open" (sekali trial).
• state — property yang bisa dibaca langsung.

Satu siklus: closed → (banyak fail) → open → (tryReset) → half-open → (success) → closed, atau half-open → (failure) → open.

Hint

• Tiga state: closed (normal), open (tolak semua), half-open (coba sekali). Simpan state sebagai property + counter failure.
• recordFailure: tambah counter. Kalau state closed dan counter >= threshold → state = "open". Kalau state half-open → langsung "open" (sekali gagal tutup lagi).
• recordSuccess: counter = 0; kalau state === "half-open" → state = "closed". tryReset: kalau state === "open" → state = "half-open" (beri kesempatan satu kali).