Introduce "use expression body" inspection #KT-16063 Fixed

Converted from the relevant intention
Reported cases: one-liners, whens
Also, more exact caret detection in local inspection tests

idea/testData/quickfix/unusedSuppressAnnotation/notForDeprecated.kt

@@ -1,5 +1,4 @@
 // "Suppress for declarations annotated by 'kotlin.Deprecated'" "false"
 // ACTION: Create test
-// ACTION: Convert to expression body
 @Deprecated("")
 fun foo<caret>(){}

idea/testData/quickfix/unusedSuppressAnnotation/notForJetBrains.kt

@@ -1,7 +1,6 @@
 // "Suppress for declarations annotated by 'org.jetbrains.annotations.NonNls'" "false"
 // ACTION: Safe delete 'foo'
 // ACTION: Create test
-// ACTION: Convert to expression body
 import org.jetbrains.annotations.NonNls
 
 @NonNls