WIP Design test suites for jvmApplication

[hfhbd]

This is just a draft, there is no jvm-test-suite logic yet, but I can implement/copy it.

But what do you think about the design?

[hfhbd]

I would love to see some kind of type safe accessor gradle/gradle#38420 and gradle/gradle#36486 to get this:

jvmApplication {
    mainClass = "org.example.SerializationKt"

    testing {
        test {
            useJUnitPlatform {
                jUnitVersion = "6.0.0"
            }
            // useKotlinTest {
            //   kotlinVersion = "2.3.20"
            // }
           dependencies {
                implementation(platform("org.junit:junit-bom:5.14.3"))
                implementation("org.junit.jupiter:junit-jupiter")
                runtimeOnly("org.junit.platform:junit-platform-launcher")
            }
        }
        kotlinTestSuite("integrationTest") {
            useJUnitPlatform {
                jUnitVersion = "6.0.0"
            }
            // useKotlinTest {
            //   kotlinVersion = "2.3.20"
            // }
           dependencies {
                implementation(platform("org.junit:junit-bom:5.14.3"))
                implementation("org.junit.jupiter:junit-jupiter")
                runtimeOnly("org.junit.platform:junit-platform-launcher")
            }
        }
    }
}