publicField -> JvmField

Effectively drop publicField and introduce JvmField (which has the same effect for now)
Implement frontend checks for @JvmField
Replace publicField -> JvmField in test data

compiler/testData/diagnostics/testsWithStdLib/annotations/jvmField/inSingleFileFacade.kt

@@ -0,0 +1,12 @@
+@file:JvmName("SomeName")
+
+@JvmField
+val c = 4
+
+@JvmField
+var g = 5
+
+class C {
+    @JvmField
+    var g = 5
+}