Add "unused equals" for direct calls without receiver

Related to KT-21192

idea/testData/inspections/unusedEquals/inspectionData/expected.xml

@@ -97,4 +97,13 @@
         <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused equals expression</problem_class>
         <description>Unused equals expression</description>
     </problem>
+
+    <problem>
+        <file>test.kt</file>
+        <line>81</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="temp:///src/test.kt" />
+        <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused equals expression</problem_class>
+        <description>Unused equals expression</description>
+    </problem>
 </problems>

idea/testData/inspections/unusedEquals/test.kt

@@ -75,6 +75,12 @@ fun foo9b() {
     consumer.ConsumerVoid<Any?> { it.equals(null) } // not used
 }
 
+fun myWith(it: Any?, f: Any?.() -> Unit) = it.f()
+
+fun foo9c() {
+    consumer.ConsumerVoid<Any?> { myWith (it) { equals(null) }} // not used
+}
+
 class Test(val successCondition: (Int) -> Boolean) {
     fun pass(num: Int): Boolean = successCondition(num)
 }