Use Plugins DSL in Kotlin Gradle scripts

When plugins DSL is used, there is no need to
manually generate typesafe accessors for extensions and
conventions (by running `./gradlew kotlinDslAccessorsSnapshot`).

core/descriptors.jvm/build.gradle.kts

@@ -1,5 +1,7 @@
-apply { plugin("kotlin") }
-apply { plugin("jps-compatible") }
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
 
 jvmTarget = "1.6"
 javaHome = rootProject.extra["JDK_16"] as String

core/descriptors.runtime/build.gradle.kts

@@ -1,6 +1,8 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
-apply { plugin("kotlin") }
+plugins {
+    kotlin("jvm")
+}
 
 dependencies {
     compileOnly(project(":core:util.runtime"))

core/descriptors/build.gradle.kts

@@ -1,5 +1,7 @@
-apply { plugin("kotlin") }
-apply { plugin("jps-compatible") }
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
 
 jvmTarget = "1.6"
 javaHome = rootProject.extra["JDK_16"] as String

core/deserialization/build.gradle.kts

@@ -1,5 +1,7 @@
-apply { plugin("kotlin") }
-apply { plugin("jps-compatible") }
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
 
 jvmTarget = "1.6"
 javaHome = rootProject.extra["JDK_16"] as String

core/metadata.jvm/build.gradle.kts

@@ -1,5 +1,7 @@
-apply { plugin("kotlin") }
-apply { plugin("jps-compatible") }
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
 
 jvmTarget = "1.6"
 javaHome = rootProject.extra["JDK_16"] as String

core/metadata/build.gradle.kts

@@ -1,7 +1,9 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
-apply { plugin("kotlin") }
-apply { plugin("jps-compatible") }
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
 
 jvmTarget = "1.6"
 javaHome = rootProject.extra["JDK_16"] as String

core/util.runtime/build.gradle.kts

@@ -1,8 +1,8 @@
 
-apply {
-    plugin("java")
-    plugin("kotlin")
-    plugin("jps-compatible")
+plugins {
+    java
+    kotlin("jvm")
+    id("jps-compatible")
 }
 
 jvmTarget = "1.6"