2.11.0 - GetItems method added

2.11.0 (December 2021)
#64: @DoubleDi added a method GetItems to retrieve all items in the cache. This method also triggers all callbacks associated with a normal Get

API changes:

// GetItems returns a copy of all items in the cache. Returns nil when the cache has been closed. 
func (cache *Cache) GetItems() map[string]interface{} {..}