Release: v6.0.0

- Added support for the new Composite Recommendation endpoint
- Added new parameter `autoPresented` for Detail View and View Portion interactions
- Added new parameter `timeSpent` for View Portion interactions
- Added support for `reqlExpressions` on recommended items

Support Recommend Items to Item Segment endpoint.

Fix returned propery values: Integer numbers should be parsed into Lo…

…ng from the JSON response

Recombee Kotlin SDK