Add SIR builder and printer for classes #KT-65905 fixed

Merge-request: KT-MR-14478
Merged-by: Artem Olkov <artem.olkov@jetbrains.com>

native/swift/swift-export-standalone/testData/classes/golden_result/result.swift

@@ -0,0 +1,4 @@
+import KotlinBridges
+
+public class Foo {
+}

native/swift/swift-export-standalone/testData/classes/input_root/classes.kt

@@ -0,0 +1,4 @@
+
+class Foo {
+    class INSIDE_CLASS // this should be ignored currently
+}

native/swift/swift-export-standalone/testData/classes/input_root/should_be_ignored.kt

@@ -0,0 +1,28 @@
+public annotation class OptIn
+
+enum ENUM {
+    class INSIDE_ENUM
+}
+
+interface OUTSIDE_PROTO {
+    class INSIDE_PROTO
+}
+
+class INHERITANCE_COUPLE : OUTSIDE_PROTO.INSIDE_PROTO, OUTSIDE_PROTO
+class INHERITANCE_SINGLE_PROTO : OUTSIDE_PROTO.INSIDE_PROTO
+
+open class OPEN_CLASS
+
+class INHERITANCE_SINGLE_CLASS : OPEN_CLASS
+
+object OBJECT
+
+data class DATA_CLASS(val a: Int)
+
+inline class INLINE_CLASS(val a: Int)
+
+abstract class ABSTRACT_CLASS
+
+sealed class SEALED {
+    object O : SEALED()
+}

native/swift/swift-export-standalone/testData/classes/input_root/should_be_ignored_packaged.kt

@@ -0,0 +1,3 @@
+package namespace
+
+class NAMESPACED_CLASS

native/swift/swift-export-standalone/tests-gen/org/jetbrains/kotlin/swiftexport/standalone/SwiftExportRunnerTest.java

@@ -24,6 +24,12 @@ public class SwiftExportRunnerTest extends AbstractSwiftRunnerTest {
     KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("native/swift/swift-export-standalone/testData"), Pattern.compile("^([^\\.]+)$"), null, false);
   }
 
+  @Test
+  @TestMetadata("classes")
+  public void testClasses() {
+    runTest("native/swift/swift-export-standalone/testData/classes/");
+  }
+
   @Test
   @TestMetadata("documentation")
   public void testDocumentation() {