KT-16535 'provideDelegate' convention is not supported in IR

Implement provideDelegate convention support.
NB delegate type now depends on 'provideDelegate' convention resolution.

compiler/testData/ir/irText/declarations/provideDelegate/memberExtension.kt

@@ -0,0 +1,12 @@
+object Host {
+    class StringDelegate(val s: String) {
+        operator fun getValue(receiver: String, p: Any) = receiver + s
+    }
+
+    operator fun String.provideDelegate(host: Any?, p: Any) = StringDelegate(this)
+
+    val String.plusK by "K"
+
+    val ok = "O".plusK
+}
+