[K/N] De-duplicate code for mangling objc interop function names

Extract the duplicated functionality to the
`ObjCFunctionNameMangleComputer` class.

compiler/fir/native/build.gradle.kts

@@ -9,6 +9,7 @@ dependencies {
     implementation(project(":compiler:fir:resolve"))
     implementation(project(":compiler:fir:fir2ir"))
     implementation(project(":compiler:ir.serialization.common"))
+    implementation(project(":compiler:ir.serialization.native"))
 }