Track stats in setTtl method for consistent hit/miss tracking

[Copilot]

The setTtl method performs a get operation to check if a key exists but doesn't track stats, leading to inconsistent hit/miss counts across the store.

Changes:

• Added incrementHits() call when item exists
• Added incrementMisses() call when item doesn't exist
• Changed condition to item !== undefined for consistency with get() method

public async setTtl(key: string | number, ttl?: number | string): Promise<boolean> {
    const item = await this._keyv.get(key.toString());
    if (item !== undefined) {
        this._stats.incrementHits();  // Now tracked
        const finalTtl = this.resolveTtl(ttl);
        await this._keyv.set(key.toString(), item, finalTtl);
        return true;
    }
    
    this._stats.incrementMisses();  // Now tracked
    return false;
}

Stats tracking now consistent across all get operations in the store.

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