[klib] Add an option to write out header klibs

The header klib is supposed to only contain the public abi of the module
similar to jvm-abi-gen. It is intended to be used as a dependency for other
klib compilations instead of the full klib for compilation avoidance.

^KT-60807

native/native.tests/testData/klib/header-klibs/compilation/privateOnlyConstructors/lib/classes.kt

@@ -0,0 +1,7 @@
+package lib
+
+class A private constructor(val x: Int) {
+    companion object {
+        fun create(x: Int): A = A(x * 2)
+    }
+}

native/native.tests/testData/klib/header-klibs/compilation/privateOnlyConstructors/main/main.kt

@@ -0,0 +1,10 @@
+package app
+
+import lib.*
+
+fun runAppAndReturnOk(): String {
+    val a = A.create(10)
+    if (a.x != 20) error("a.x is '${a.x}', but is expected to be '20'")
+
+    return "OK"
+}