FIR: Add simple test on SAM conversion for callable receivers

^KT-32725 In Progress

compiler/fir/resolve/testData/diagnostics/callableReferences/sam.kt

@@ -0,0 +1,14 @@
+interface MySam {
+    fun run(x: String): Int
+}
+
+class A {
+    fun bar(x: String): Int {}
+}
+
+fun foo(x: MySam) {}
+
+fun main() {
+    val a = A()
+    foo(a::bar)
+}

compiler/fir/resolve/testData/diagnostics/callableReferences/sam.txt

@@ -0,0 +1,20 @@
+FILE: sam.kt
+    public abstract interface MySam : R|kotlin/Any| {
+        public abstract fun run(x: R|kotlin/String|): R|kotlin/Int|
+
+    }
+    public final class A : R|kotlin/Any| {
+        public constructor(): R|A| {
+            super<R|kotlin/Any|>()
+        }
+
+        public final fun bar(x: R|kotlin/String|): R|kotlin/Int| {
+        }
+
+    }
+    public final fun foo(x: R|MySam|): R|kotlin/Unit| {
+    }
+    public final fun main(): R|kotlin/Unit| {
+        lval a: R|A| = R|/A.A|()
+        R|/foo|(R|<local>/a|::R|/A.bar|)
+    }

compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirDiagnosticsTestGenerated.java

@@ -100,6 +100,11 @@ public class FirDiagnosticsTestGenerated extends AbstractFirDiagnosticsTest {
             runTest("compiler/fir/resolve/testData/diagnostics/callableReferences/properties.kt");
         }
 
+        @TestMetadata("sam.kt")
+        public void testSam() throws Exception {
+            runTest("compiler/fir/resolve/testData/diagnostics/callableReferences/sam.kt");
+        }
+
         @TestMetadata("simpleClassReceiver.kt")
         public void testSimpleClassReceiver() throws Exception {
             runTest("compiler/fir/resolve/testData/diagnostics/callableReferences/simpleClassReceiver.kt");