Add inspection to replace not-null assertion with elvis return

#KT-30381 Fixed

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/.inspection

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

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/basic.kt

@@ -0,0 +1,3 @@
+fun test(i: Int?) {
+    val x = i!!<caret>
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/basic.kt.after

@@ -0,0 +1,3 @@
+fun test(i: Int?) {
+    val x = i ?: return
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/basic2.kt

@@ -0,0 +1,5 @@
+fun foo(): Int? = null
+
+fun test() {
+    foo()!!<caret>
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/basic2.kt.after

@@ -0,0 +1,5 @@
+fun foo(): Int? = null
+
+fun test() {
+    foo() ?: return
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/basic3.kt

@@ -0,0 +1,6 @@
+class Foo(val i: Int?)
+
+fun test(foo: Foo): Int? {
+    val x = foo.i!!<caret>
+    return x
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/basic3.kt.after

@@ -0,0 +1,6 @@
+class Foo(val i: Int?)
+
+fun test(foo: Foo): Int? {
+    val x = foo.i ?: return null
+    return x
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/basic4.kt

@@ -0,0 +1,8 @@
+class Foo {
+    fun baz(): Int? = null
+}
+
+fun test(foo: Foo): Int? {
+    foo.baz()!!<caret>
+    return 0
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/basic4.kt.after

@@ -0,0 +1,8 @@
+class Foo {
+    fun baz(): Int? = null
+}
+
+fun test(foo: Foo): Int? {
+    foo.baz() ?: return null
+    return 0
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/basic5.kt

@@ -0,0 +1,3 @@
+fun test(i: Int?) {
+    val x = i!!<caret> + 1
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/basic5.kt.after

@@ -0,0 +1,3 @@
+fun test(i: Int?) {
+    val x = (i ?: return) + 1
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/inLambda.kt

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+fun test(list: List<String>, number: Int?) {
+    list.forEach {
+        number!!<caret>
+    }
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/inLambda.kt.after

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+fun test(list: List<String>, number: Int?) {
+    list.forEach {
+        number ?: return@forEach
+    }
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/inLambda2.kt

@@ -0,0 +1,7 @@
+// PROBLEM: none
+// WITH_RUNTIME
+fun test(list: List<String>, number: Int?) {
+    val x: List<Int> = list.map {
+        number!!<caret>
+    }
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/notNullFunction.kt

@@ -0,0 +1,5 @@
+// PROBLEM: none
+fun test(i: Int?): Int {
+    val x = i!!<caret>
+    return x
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/onReturn.kt

@@ -0,0 +1,4 @@
+// PROBLEM: none
+fun test(i: Int?): Int? {
+    return i!!<caret>
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/onReturn2.kt

@@ -0,0 +1,4 @@
+// PROBLEM: none
+fun test(i: Int?): Int? {
+    return (i!!<caret>)
+}

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/onReturn3.kt

@@ -0,0 +1,5 @@
+fun test(a: Int?): Int? {
+    return check(a!!<caret>)
+}
+
+fun check(i: Int): Int = i

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/onReturn3.kt.after

@@ -0,0 +1,5 @@
+fun test(a: Int?): Int? {
+    return check(a ?: return null)
+}
+
+fun check(i: Int): Int = i

idea/testData/inspectionsLocal/replaceNotNullAssertionWithElvisReturn/unnecessaryNotNullAssertion.kt

@@ -0,0 +1,4 @@
+// PROBLEM: none
+fun test(i: Int) {
+    val x = i!!<caret>
+}