[Analysis API] add tests for delegate field

^KT-64584

analysis/analysis-api/testData/components/scopeProvider/declaredMemberScope/delegateInterface.kt

@@ -0,0 +1,13 @@
+// FILE: A.kt
+interface A {
+    var Int.zoo: Unit
+    fun foo()
+    fun Int.smth(): Short
+    val foo: Int
+    var bar: Long
+    val Int.doo: String
+}
+®
+class I(private val p: A) : A by p
+
+// class: I