Make "Add operator modifier" an inspection instead of intention

#KT-31533 Fixed

idea/testData/inspectionsLocal/addOperatorModifier/.inspection

@@ -0,0 +1 @@
+org.jetbrains.kotlin.idea.inspections.AddOperatorModifierInspection

idea/testData/inspectionsLocal/addOperatorModifier/containsBool.kt

@@ -0,0 +1,3 @@
+class A {
+    fun <caret>contains(other: A): Boolean = true
+}

idea/testData/inspectionsLocal/addOperatorModifier/containsBool.kt.after

@@ -0,0 +1,3 @@
+class A {
+    operator fun <caret>contains(other: A): Boolean = true
+}

idea/testData/inspectionsLocal/addOperatorModifier/containsInt.kt

@@ -0,0 +1,4 @@
+// PROBLEM: none
+class A {
+    fun <caret>contains(other: A): Int = -1
+}

idea/testData/inspectionsLocal/addOperatorModifier/extension.kt

@@ -0,0 +1,4 @@
+class A {
+}
+
+fun A.<caret>plus(other: A): A = A()

idea/testData/inspectionsLocal/addOperatorModifier/extension.kt.after

@@ -0,0 +1,4 @@
+class A {
+}
+
+operator fun A.<caret>plus(other: A): A = A()

idea/testData/inspectionsLocal/addOperatorModifier/forOverride.kt

@@ -0,0 +1,9 @@
+open class A {
+    open fun plus(other: A): A = A()
+}
+
+class B : A() {
+    override fun <caret>plus(other: A): A {
+        return super.plus(other)
+    }
+}

idea/testData/inspectionsLocal/addOperatorModifier/forOverride.kt.after

@@ -0,0 +1,9 @@
+open class A {
+    open fun plus(other: A): A = A()
+}
+
+class B : A() {
+    override operator fun <caret>plus(other: A): A {
+        return super.plus(other)
+    }
+}

idea/testData/inspectionsLocal/addOperatorModifier/overridden.kt

@@ -0,0 +1,8 @@
+// PROBLEM: none
+open class A {
+    open operator fun plus(a: A) = A()
+}
+
+class B : A() {
+    override fun plu<caret>s(a: A) = A()
+}

idea/testData/inspectionsLocal/addOperatorModifier/simple.kt

@@ -0,0 +1,3 @@
+class A {
+    public fun <caret>plus(other: A): A = A()
+}

idea/testData/inspectionsLocal/addOperatorModifier/simple.kt.after

@@ -0,0 +1,3 @@
+class A {
+    public operator fun plus(other: A): A = A()
+}

idea/testData/inspectionsLocal/addOperatorModifier/toplevel.kt

@@ -0,0 +1,5 @@
+// PROBLEM: none
+class A {
+}
+
+fun <caret>plus(other: A): A = A()