Investigate for a `Log` trait

[theredfish]

We currently manage logs via a structure and different methods called depending on the part under test.

Ideally each DSL should implement its own behaviour so we can personalize the output format. The recent work on jsonpath highlighted the need of a more complex log structure which is introducing a Hand::Compound variant (also used by between predicate).

The current log system needs to be revisited. The first step would be to investigate with small tests to decide the best way to generate logs and then write the feature.

Later we will also introduce the concept of drivers so we can connect to services like elasticsearch. To keep in mind.