Extraction Engine: Generate function/property accessor with expression body (whenever applicable)

#KT-6405 Fixed

idea/testData/refactoring/extractFunction/parameters/misc/multipleOccurrences.kt.after

@@ -9,6 +9,4 @@ fun foo(a: Int, b: Int, c: Int): Int {
     return i(a, b, c)
 }
 
-private fun i(a: Int, b: Int, c: Int): Int {
-    return (a + b * a - c) + b * c
-}
+private fun i(a: Int, b: Int, c: Int) = (a + b * a - c) + b * c

idea/testData/refactoring/extractFunction/parameters/misc/usagesInCallArgs.kt.after

@@ -13,9 +13,7 @@ public class A() {
     }
 }
 
-private fun i(a: A, t: Int, u: Int, x: Int): Int {
-    return a.bar(t - x, u + x)
-}
+private fun i(a: A, t: Int, u: Int, x: Int) = a.bar(t - x, u + x)
 
 fun foo(a: A, x: Int): Int {
     val t = 10