CacheMap<K, T> constructor Null safety

1. smooth_app
2. cache_manager
3. CacheMap<K, T>
4. CacheMap constructor

CacheMap class

1. Constructors
2. CacheMap
3. Properties
4. hashCode
5. length
6. runtimeType
7. Methods
8. clear
9. containsKey
10. get
11. noSuchMethod
12. put
13. remove
14. toString
15. Operators
16. operator ==