[K/N] Convert :kotlin-native:Interop:StubGenerator

Use folder structure from the rest of the project and build it by
the bootstrap compiler.

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/objc/dependency.def

@@ -0,0 +1,3 @@
+headers = dependency.h
+headerFilter = dependency.h
+language = Objective-C

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/objc/dependency.h

@@ -0,0 +1,7 @@
+@class DependencyClassUsed;
+@class DependencyClassUnused;
+@class DependencyAndMainClass;
+
+@protocol DependencyProtocolUsed;
+@protocol DependencyProtocolUnused;
+@protocol DependencyAndMainProtocol;

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/objc/imported.h

@@ -0,0 +1,5 @@
+@class ImportedClassUsed;
+@class ImportedClassUnused;
+
+@protocol ImportedProtocolUsed;
+@protocol ImportedProtocolUnused;

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/objc/included.h

@@ -0,0 +1,2 @@
+@class IncludedClassUsed, IncludedClassUnused;
+@protocol IncludedProtocolUsed, IncludedProtocolUnused;

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/objc/main.def

@@ -0,0 +1,3 @@
+headers = main.h
+headerFilter = main.h included.h dependency.h
+language = Objective-C

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/objc/main.h

@@ -0,0 +1,17 @@
+#import "dependency.h"
+#import "imported.h"
+#import "included.h"
+
+
+@class MainClassUsed;
+@class MainClassUnused;
+@class DependencyAndMainClass;
+
+@protocol MainProtocolUsed;
+@protocol MainProtocolUnused;
+@protocol DependencyAndMainProtocol;
+
+void useDependency(DependencyClassUsed*, id<DependencyProtocolUsed>);
+void useImported(ImportedClassUsed*, id<ImportedProtocolUsed>);
+void useIncluded(IncludedClassUsed*, id<IncludedProtocolUsed>);
+void useMain(MainClassUsed*, id<MainProtocolUsed>);