Add support of Kover Gradle Plugin to IntelliJ IDEA

[shanshin]

The IntelliJ IDEA should be able to configure the plugin using the UI.

Basic features:

• when importing Gradle model, determine that the Kover Gradle Plugin has been applied
• read Kover Gradle Plugin settings from build scripts
• show Kover settings
• allow to disable instrumentation by the Kover agent (it is necessary to design whether Kover will always be disabled by default or it is necessary to explicitly turn it off)
• think about how Kover will be combined with the Run with Coverage function
• allow to configure the Kover Gradle Plugin using the UI and save these changes in the build script files
• automatically upload the coverage results of all running test tasks after build with the Kover

[shanshin]

Point think about how Kover will be combined with the Run with Coverage function solves issue #7