Provide test coverage for binding-data-codec using sal-test-model

project sal-test-model and test models in sal-binding-broker-impl were designed also to test serialization and deserialization of data from / to normalized nodes.

In order to prevent regressions, it is better to extract serialization / deserialization related tests and move them as unit tests for binding-data-codec project.

Models should be moved to new project binding-test-model, which will contain models for testing of binding specification / edge cases.