docs(model-api-gen): add comments to extracted supertypes

Author: mhuster23

model-api-gen/src/main/kotlin/org/modelix/metamodel/generator/internal/FileGenerator.kt

@@ -19,6 +19,9 @@ package org.modelix.metamodel.generator.internal
 import com.squareup.kotlinpoet.FileSpec
 import java.nio.file.Path
 
+/**
+ * Deduplicates common logic for file generation.
+ */
 internal interface FileGenerator {
     val outputDir: Path
 

model-api-gen/src/main/kotlin/org/modelix/metamodel/generator/internal/NameConfigBasedGenerator.kt

@@ -37,6 +37,10 @@ import org.modelix.model.data.EnumPropertyType
 import org.modelix.model.data.Primitive
 import org.modelix.model.data.PrimitivePropertyType
 
+/**
+ * Base class for generators using [NameConfig].
+ * Acts as single source of truth for functions needed in multiple internal generators.
+ */
 internal abstract class NameConfigBasedGenerator(open val nameConfig: NameConfig) {
     protected fun ProcessedConcept.conceptWrapperInterfaceType() =
         conceptWrapperInterfaceClass().parameterizedBy(nodeWrapperInterfaceType())