Need samples of using GenericMapLoader and/or GenericMapStore

The official Hazelcast documentation provides some details about how to configure GenericMapStore (or GenericMapLoader), but does not explain for example that the resulting objects in the distributed map are stored as GenericRecord.
There is also no information about what the additional dependencies that need to be added to the pom.

I had to add:
```html

com.hazelcast
hazelcast-sql


com.hazelcast
hazelcast-mapstore

```

Also, I had to build a map interceptor in order to store the data in my own POJO (querying map with generic records is difficult).
Would be great to offer these concepts to the community.