[KLIB] Lift up -Xmetadata-klib CLI key from Native to Common args

This is a precondition for obsoleting and finally removing
`-Xexpect-actual-linker` CLI key, which became useless since
the removal of ExpectActualTable.

^KT-61136

compiler/config/src/org/jetbrains/kotlin/config/CommonConfigurationKeys.kt

@@ -63,6 +63,9 @@ object CommonConfigurationKeys {
     @JvmField
     val EXPECT_ACTUAL_LINKER = CompilerConfigurationKey.create<Boolean>("Experimental expect/actual linker")
 
+    @JvmField
+    val METADATA_KLIB = CompilerConfigurationKey.create<Boolean>("Produce metadata klib")
+
     @JvmField
     val USE_FIR_EXTENDED_CHECKERS = CompilerConfigurationKey.create<Boolean>("fir extended checkers")