KT-9839 related, secondary constructor to primary: inspection for the single constructor

(cherry picked from commit aec0090)

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

@@ -0,0 +1,10 @@
+<problems>
+    <problem>
+        <file>test.kt</file>
+        <line>5</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="temp:///src/test.kt" />
+        <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Convert to primary constructor</problem_class>
+        <description>Convert to primary constructor</description>
+    </problem>
+</problems>

idea/testData/inspections/convertSecondaryToPrimary/inspectionData/inspections.test

@@ -0,0 +1 @@
+// INSPECTION_CLASS: org.jetbrains.kotlin.idea.intentions.ConvertSecondaryConstructorToPrimaryInspection

idea/testData/inspections/convertSecondaryToPrimary/test.kt

@@ -0,0 +1,19 @@
+class Single {
+
+    val x: Int
+
+    constructor(x: Int) {
+        this.x = x
+    }
+}
+
+class NotSingle {
+
+    val x: Int
+
+    constructor(): this(42)
+
+    constructor(x: Int) {
+        this.x = x
+    }
+}