FIR: implement Java fields (in provider, type enhancement, scopes)

Related to KT-29218

compiler/testData/loadJava/compiledJava/enum/EnumMembers.fir.txt

@@ -1,4 +1,7 @@
 public final enum class EnumMembers : R|java/lang/Enum<test/EnumMembers>| {
+    public final property isFirst(val): R|kotlin/Boolean|
+        public get(): R|kotlin/Boolean|
+
     public open operator function first(): R|kotlin/Boolean|
 
 }