Consider integrating with kotlinFixtures

[shanshin]

To plan further actions, it is necessary to evaluate the current interaction between Kover Gradle Plugin and kotlinFixtures.

After review, it is necessary to develop a plan for modification of Kover Gradle plugin, or prepare instructions for configuring the project with kotlinFixtures.

As a result, we must either fully support working with kotlinFixtures, or (if possible) explicitly indicate in the documentation how limited it can be used.

[shanshin]

This task will be taken into account when migrating to Kotlin Gradle Plugin.

In the future, it will be moved to the Kotlin task tracker, or closed if it loses relevance.