chore: Release 1.6.0

## [1.6.0](https://code.vereign.com/gaiax/ocm/ocm-engine/compare/v1.5.0...v1.6.0) (2023-06-13)

### Features

* implement agent events for basic messages ([c8a5a16f](https://code.vereign.com/gaiax/ocm/ocm-engine/commit/c8a5a16fe7b807ee1abd77a8469b6e21ddde12a7))