Introduce inspection to detect vals might be marked as const

So #KT-20644 Fixed

idea/testData/inspectionsLocal/mayBeConstant/cascadeConst.kt

@@ -0,0 +1,9 @@
+// WITH_RUNTIME
+
+const val y = 0
+
+class Your {
+    companion object {
+        @JvmField val <caret>z = y + 3
+    }
+}