improvements in ksp parts

ksp/generator/src/main/kotlin/KSClassDeclarationBuildSubFileName.kt

@@ -0,0 +1,13 @@
+package dev.inmo.micro_ksp.generator
+
+import com.google.devtools.ksp.symbol.KSClassDeclaration
+
+val KSClassDeclaration.buildSubFileName: String
+    get() {
+        val parentDeclarationCaptured = parentDeclaration
+        val simpleNameString = simpleName.asString()
+        return when (parentDeclarationCaptured) {
+            is KSClassDeclaration -> parentDeclarationCaptured.buildSubFileName
+            else -> ""
+        } + simpleNameString
+    }

ksp/generator/src/main/kotlin/KSClassDeclarationCompanion.kt

@@ -0,0 +1,8 @@
+package dev.inmo.micro_ksp.generator
+
+import com.google.devtools.ksp.symbol.KSClassDeclaration
+
+val KSClassDeclaration.companion
+    get() = declarations.firstNotNullOfOrNull {
+        (it as? KSClassDeclaration)?.takeIf { it.isCompanionObject }
+    }

ksp/generator/src/main/kotlin/ResolveSubclasses.kt

@@ -0,0 +1,11 @@
+package dev.inmo.micro_ksp.generator
+
+import com.google.devtools.ksp.symbol.KSClassDeclaration
+
+fun KSClassDeclaration.resolveSubclasses(): List<KSClassDeclaration> {
+    return (getSealedSubclasses().flatMap {
+        it.resolveSubclasses()
+    }.ifEmpty {
+        sequenceOf(this)
+    }).toList()
+}