feat: implement drop functionality

- Added `drop()` function in buckets.
- Implemented `Drop()` function for Table.

bucket.go

@@ -26,6 +26,17 @@ func (b bucket[K, V]) get(key K) (value V, found bool) {
 	return slot.value, slot.occupied && b.compare(slot.key, key)
 }
 
+func (b bucket[K, V]) drop(key K) (occupied bool) {
+	slot := &b.slots[b.location(key)]
+
+	if slot.occupied && b.compare(slot.key, key) {
+		slot.occupied = false
+		return true
+	}
+
+	return false
+}
+
 func (b *bucket[K, V]) resize(capacity uint64) {
 	b.slots = make([]slot[K, V], capacity)
 	b.capacity = capacity