Support -Xexperimental and -Xuse-experimental, validate their values

#KT-22759 In Progress

compiler/testData/cli/jvm/experimentalNested.kt

@@ -0,0 +1,9 @@
+package org.test
+
+class Outer {
+    @Experimental(Experimental.Level.ERROR, [Experimental.Impact.LINKAGE])
+    annotation class Nested
+}
+
+@Outer.Nested
+fun foo() {}