Track stats (hits/misses) in setTtl and take methods

[Copilot]

The setTtl method was checking item existence via get() but not tracking hits/misses, creating inconsistent stats compared to other cache operations.

Changes

• Stats tracking in setTtl: Increments hits when item exists, misses when not found
• Stats tracking in take: Same pattern applied for consistency across all retrieval operations
• Public stats accessor: Added get stats() to enable verification of tracking behavior
• Condition consistency: Changed if (item) to if (item !== undefined) to match get() method semantics

Example

const store = new NodeCacheStore();
await store.set("key", "value");

// Previously: no stats tracked
await store.setTtl("key", 1000);        // Now: increments hits
await store.setTtl("missing", 1000);    // Now: increments misses
await store.take("key");                // Now: increments hits

All methods that retrieve from cache now consistently track hits/misses.

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