FIR: introduce delegate diagnostics

This commit adds diagnostics for the following

* DELEGATE_SPECIAL_FUNCTION_MISSING
* DELEGATE_SPECIAL_FUNCTION_AMBIGUITY
* DELEGATE_SPECIAL_FUNCTION_NONE_APPLICABLE

compiler/testData/diagnostics/tests/controlFlowAnalysis/fieldAsClassDelegate.fir.kt

@@ -29,9 +29,9 @@ private fun <T> lazy(init: () -> T): <!UNRESOLVED_REFERENCE!>kotlin.Lazy<T><!> {
 }
 
 object DefaultHttpClientWithBy : HttpClient by client {
-    val client by <!UNRESOLVED_REFERENCE!>lazy<!> { HttpClientImpl() }
+    val client by lazy { HttpClientImpl() }
 }
 
 object DefaultFqHttpClient : HttpClient by DefaultFqHttpClient.client {
     val client = HttpClientImpl()
-}
+}