Uast: handling @receiver annotations

plugins/uast-kotlin/testData/ReceiverFun.kt

@@ -0,0 +1,3 @@
+annotation class MyReceiverAnnotation
+
+fun @receiver:MyReceiverAnnotation String.foo() = this.length

plugins/uast-kotlin/testData/ReceiverFun.log.txt

@@ -0,0 +1,10 @@
+UFile (package = )
+    UClass (name = ReceiverFunKt)
+        UAnnotationMethod (name = foo)
+            UParameter (name = $receiver)
+                UAnnotation (fqName = MyReceiverAnnotation)
+                UAnnotation (fqName = org.jetbrains.annotations.NotNull)
+            UQualifiedReferenceExpression
+                UThisExpression (label = null)
+                USimpleNameReferenceExpression (identifier = length)
+    UClass (name = MyReceiverAnnotation)

plugins/uast-kotlin/testData/ReceiverFun.render.txt

@@ -0,0 +1,6 @@
+public final class ReceiverFunKt {
+    public static final fun foo(@MyReceiverAnnotation @org.jetbrains.annotations.NotNull $receiver: java.lang.String) : int = this.length
+}
+
+public abstract annotation MyReceiverAnnotation {
+}