allow returning multiple PsiMethod wrappers for a JetFunction or JetPropertyAccessor; use that for handling Java usages through old-style and new-style facades

#KT-9102 Fixed

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTopLevelMethodUsages.3.java

@@ -0,0 +1,11 @@
+package client;
+
+import server.KotlinTopLevelMethodUsages_0Kt;
+
+class JClient {
+    String s = KotlinTopLevelMethodUsages_0Kt.processRequest();
+
+    String sendRequest() {
+        return KotlinTopLevelMethodUsages_0Kt.processRequest();
+    }
+}

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTopLevelMethodUsages.results.txt

@@ -2,4 +2,6 @@
 [kotlinTopLevelMethodUsages.1.kt] Function call (10: 9) processRequest()
 [kotlinTopLevelMethodUsages.1.kt] Usage in import (3: 15) import server.processRequest
 [kotlinTopLevelMethodUsages.2.java] Unclassified usage (6: 30) String s = ServerPackage.processRequest();
-[kotlinTopLevelMethodUsages.2.java] Unclassified usage (9: 30) return ServerPackage.processRequest();
+[kotlinTopLevelMethodUsages.2.java] Unclassified usage (9: 30) return ServerPackage.processRequest();
+[kotlinTopLevelMethodUsages.3.java] Unclassified usage (6: 47) String s = KotlinTopLevelMethodUsages_0Kt.processRequest();
+[kotlinTopLevelMethodUsages.3.java] Unclassified usage (9: 47) return KotlinTopLevelMethodUsages_0Kt.processRequest();

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTopLevelMethodUsagesWithRenamedFile.0.kt

@@ -0,0 +1,7 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetNamedFunction
+// OPTIONS: usages
+@file:JvmName("RequestProcessor")
+package server
+
+fun <caret>processRequest() = "foo"
+

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTopLevelMethodUsagesWithRenamedFile.1.java

@@ -0,0 +1,11 @@
+package client;
+
+import server.RequestProcessor;
+
+class JClient {
+    String s = RequestProcessor.processRequest();
+
+    String sendRequest() {
+        return RequestProcessor.processRequest();
+    }
+}

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinTopLevelMethodUsagesWithRenamedFile.results.txt

@@ -0,0 +1,2 @@
+Unclassified usage (6: 33) String s = RequestProcessor.processRequest();
+Unclassified usage (9: 33) return RequestProcessor.processRequest();

idea/testData/findUsages/kotlin/findPropertyUsages/kotlinTopLevelPropertyUsages.3.java

@@ -0,0 +1,11 @@
+package client;
+
+import server.KotlinTopLevelPropertyUsages_0Kt;
+
+class JClient {
+    void fooBar() {
+        System.out.println("foo = " + KotlinTopLevelPropertyUsages_0Kt.getFoo());
+        System.out.println("length: " + KotlinTopLevelPropertyUsages_0Kt.getFoo().length());
+        KotlinTopLevelPropertyUsages_0Kt.setFoo("");
+    }
+}

idea/testData/findUsages/kotlin/findPropertyUsages/kotlinTopLevelPropertyUsages.results.txt

@@ -3,4 +3,7 @@
 [kotlinTopLevelPropertyUsages.1.kt] Value read (7: 33) println("foo = ${server.foo}")
 [kotlinTopLevelPropertyUsages.2.java] Unclassified usage (7: 53) System.out.println("foo = " + ServerPackage.getFoo());
 [kotlinTopLevelPropertyUsages.2.java] Unclassified usage (8: 55) System.out.println("length: " + ServerPackage.getFoo().length());
-[kotlinTopLevelPropertyUsages.2.java] Unclassified usage (9: 23) ServerPackage.setFoo("");
+[kotlinTopLevelPropertyUsages.2.java] Unclassified usage (9: 23) ServerPackage.setFoo("");
+[kotlinTopLevelPropertyUsages.3.java] Unclassified usage (7: 72) System.out.println("foo = " + KotlinTopLevelPropertyUsages_0Kt.getFoo());
+[kotlinTopLevelPropertyUsages.3.java] Unclassified usage (8: 74) System.out.println("length: " + KotlinTopLevelPropertyUsages_0Kt.getFoo().length());
+[kotlinTopLevelPropertyUsages.3.java] Unclassified usage (9: 42) KotlinTopLevelPropertyUsages_0Kt.setFoo("");