Add inspection for calls of function with lambda expression body

Added "Unused return value of a function with lambda expression body" inspection with quickfix "Remove '=' token from function declaration"

#KT-10393 Fixed

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

@@ -0,0 +1,18 @@
+<problems>
+    <problem>
+        <file>simple.kt</file>
+        <line>3</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="temp:///src/simple.kt" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Unused return value of a function with lambda expression body</problem_class>
+        <description>Unused return value of a function with lambda expression body</description>
+    </problem>
+    <problem>
+        <file>simple.kt</file>
+        <line>6</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="temp:///src/simple.kt" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Unused return value of a function with lambda expression body</problem_class>
+        <description>Unused return value of a function with lambda expression body</description>
+    </problem>
+</problems>

idea/testData/inspections/unusedLambdaExpressionBody/inspectionData/inspections.test

@@ -0,0 +1 @@
+// INSPECTION_CLASS: org.jetbrains.kotlin.idea.inspections.UnusedLambdaExpressionBodyInspection

idea/testData/inspections/unusedLambdaExpressionBody/simple.kt

@@ -0,0 +1,13 @@
+
+fun foo() {
+    bar()
+    val a = bar()
+    if (bar() != null) {
+        bar()
+    }
+    bar()()
+}
+
+fun bar() = {
+
+}