FIR: Add more tests for delegate inference

compiler/fir/analysis-tests/testData/resolve/delegates/receiverInference.kt

@@ -0,0 +1,17 @@
+import kotlin.reflect.KProperty
+
+
+interface XEntity
+class Provider<out R> {
+    operator fun provideDelegate(thisRef: XEntity, prop: Any): R = null!!
+}
+
+class Prop<E, V> {
+    operator fun getValue(receiver: E, prop: Any): V = null!!
+}
+
+fun <R: XEntity, V> mkProp(): Provider<Prop<R, V>> = Provider()
+
+class MyEnt: XEntity {
+    val d: String by mkProp()
+}