[Gradle][MPP] Mark KotlinTargetsContainer and KotlinTargetHierarchyBuilder with KotlinTargetsDsl annotation

To prevent confusing shortcuts defined on `KotlinTargetsContainer`
when declaring a KotlinTargetHierarchy:

e.g.

```kotlin
kotlin {
    targetHierarchy.default {
        common {
            ios() // <- [DSL_SCOPE_VIOLATION]
            //'fun ios(): Unit' can't be called in this context
            // by implicit receiver. Use the explicit one if necessary
        }
    }
 }
```

^KT-53570 Verification Pending

libraries/tools/kotlin-gradle-plugin-api/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinTargetHierarchyBuilder.kt

@@ -4,6 +4,7 @@ package org.jetbrains.kotlin.gradle.plugin
 
 import org.jetbrains.kotlin.gradle.ExperimentalKotlinGradlePluginApi
 
+@KotlinTargetsDsl
 @ExperimentalKotlinGradlePluginApi
 interface KotlinTargetHierarchyBuilder {
     /* Declaring groups */

libraries/tools/kotlin-gradle-plugin-api/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinTargetsContainer.kt

@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.gradle.plugin
 import org.gradle.api.NamedDomainObjectCollection
 import org.gradle.api.NamedDomainObjectContainer
 
+@KotlinTargetsDsl
 interface KotlinTargetsContainer {
     val targets: NamedDomainObjectCollection<KotlinTarget>
 }

libraries/tools/kotlin-gradle-plugin-api/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinTargetsDsl.kt

@@ -0,0 +1,10 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.plugin
+
+@DslMarker
+@Retention(AnnotationRetention.SOURCE)
+annotation class KotlinTargetsDsl