Kapt: Don't convert field initializers for enum fields inside companion objects (KT-37732)

For classes with companion objects, Kotlin compiler generates a 'Companion' static accessor field.
Java prioritizes fields over inner types (apparently, Scala does this as well, KT-29864), so the generated initializer doesn't compile.
As a workaround, initializer generatation is disabled for enum fields inside companion objects. Certainly, it's not a proper fix, however it does fix the regression.

plugins/kapt3/kapt3-compiler/testData/converter/enumInCompanion.kt

@@ -0,0 +1,45 @@
+class Test {
+    private val foo = Example.FOO
+
+    companion object {
+        enum class Example { FOO }
+    }
+}
+
+class Test2 {
+    private val foo = Example.FOO
+
+    companion object Amigo {
+        enum class Example { FOO }
+    }
+}
+
+class Test3 {
+    private val foo = Amigo.Example.FOO
+
+    object Amigo {
+        enum class Example { FOO }
+    }
+}
+
+class Test4 {
+    private val foo = Foo.constProperty
+
+    companion object {
+        object Foo {
+            const val constProperty = 1
+        }
+    }
+}
+
+class Test5 {
+    private val foo = Amigos.Companion.Goo.Example.FOO
+
+    class Amigos {
+        companion object {
+            class Goo {
+                enum class Example { FOO }
+            }
+        }
+    }
+}