[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/comparison/syntheticAccessors/base/test.kt

@@ -0,0 +1,7 @@
+package test
+
+private val x = 1
+
+object A { fun f() = x }
+
+val y = 2

native/native.tests/testData/klib/header-klibs/comparison/syntheticAccessors/sameAbi/test.kt

@@ -0,0 +1,5 @@
+package test
+
+object A { fun f() = 1 }
+
+val y = 2