Formatting: add line break between '{' and enum entry (KT-28227)

#KT-28227 Fixed

idea/formatter/src/org/jetbrains/kotlin/idea/formatter/kotlinSpacingRules.kt

@@ -588,6 +588,12 @@ fun createSpacingBuilder(settings: CodeStyleSettings, builderUtil: KotlinSpacing
                     createSpacing(spaces)
                 }
             }
+
+            inPosition(
+                parent = CLASS_BODY,
+                left = LBRACE,
+                right = ENUM_ENTRY
+            ).lineBreakIfLineBreakInParent(numSpacesOtherwise = 1)
         }
 
         simple {

idea/testData/formatter/EmptyLineBetweenEnumEntries.after.inv.kt

@@ -30,4 +30,14 @@ enum class E8 {
     B  // B
 }
 
+enum class E9 {
+    F, S, T
+}
+
+enum class E10 {
+    F, S, T;
+
+    val x = 1
+}
+
 // SET_TRUE: KEEP_LINE_BREAKS

idea/testData/formatter/EmptyLineBetweenEnumEntries.after.kt

@@ -32,4 +32,14 @@ enum class E8 {
     B  // B
 }
 
+enum class E9 {
+    F, S, T
+}
+
+enum class E10 {
+    F, S, T;
+
+    val x = 1
+}
+
 // SET_TRUE: KEEP_LINE_BREAKS

idea/testData/formatter/EmptyLineBetweenEnumEntries.kt

@@ -29,4 +29,11 @@ enum class E8 {
     B  // B
 }
 
+enum class E9 { F, S, T
+}
+
+enum class E10 { F, S, T;
+    val x = 1
+}
+
 // SET_TRUE: KEEP_LINE_BREAKS