FIR IDE: add Java synthetic properties support for completion

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

@@ -0,0 +1,8 @@
+// FIR_COMPARISON
+
+fun foo(a: java.lang.Thread) {
+    a.na<caret>
+}
+
+
+// EXIST: {"lookupString":"name","tailText":" (from getName()/setName())","allLookupStrings":"getName, name, setName","itemText":"name"}

idea/idea-completion/testData/handlers/basic/SyntheticExtension.kt

@@ -1,3 +1,5 @@
+// FIR_COMPARISON
+
 import java.io.File
 
 fun foo(file: File) {

idea/idea-completion/testData/handlers/basic/SyntheticExtension.kt.after

@@ -1,3 +1,5 @@
+// FIR_COMPARISON
+
 import java.io.File
 
 fun foo(file: File) {

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

@@ -2950,6 +2950,11 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
             runTest("idea/idea-completion/testData/basic/java/JavaPackage.kt");
         }
 
+        @TestMetadata("JavaSyntheticProperty.kt")
+        public void testJavaSyntheticProperty() throws Exception {
+            runTest("idea/idea-completion/testData/basic/java/JavaSyntheticProperty.kt");
+        }
+
         @TestMetadata("KProperty.kt")
         public void testKProperty() throws Exception {
             runTest("idea/idea-completion/testData/basic/java/KProperty.kt");