Mixin kotlin.Number methods into j.l.Number member scope

#KT-9672 Fixed

idea/idea-completion/testData/basic/java/Number.kt

@@ -0,0 +1,10 @@
+fun test(x: java.lang.Integer) {
+    x.<caret>
+}
+
+// EXIST: toByte
+// EXIST: toShort
+// EXIST: toInt
+// EXIST: toLong
+// EXIST: toFloat
+// EXIST: toDouble

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JvmBasicCompletionTestGenerated.java

@@ -2302,6 +2302,12 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
             doTest(fileName);
         }
 
+        @TestMetadata("Number.kt")
+        public void testNumber() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/java/Number.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("PackageDirective.kt")
         public void testPackageDirective() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/idea-completion/testData/basic/java/PackageDirective.kt");