feat: not uppercasing readonly fields

Author: jhonabreul

src/embed_tests/ClassManagerTests.cs

@@ -110,10 +110,10 @@ public void BindsSnakeCaseClassMethods(string originalMethodName, string snakeCa
 
         [TestCase("PublicStringField", "public_string_field")]
         [TestCase("PublicStaticStringField", "public_static_string_field")]
+        [TestCase("PublicReadonlyStringField", "public_readonly_string_field")]
+        [TestCase("PublicStaticReadonlyStringField", "public_static_readonly_string_field")]
         // Constants
         [TestCase("PublicConstStringField", "PUBLIC_CONST_STRING_FIELD")]
-        [TestCase("PublicReadonlyStringField", "PUBLIC_READONLY_STRING_FIELD")]
-        [TestCase("PublicStaticReadonlyStringField", "PUBLIC_STATIC_READONLY_STRING_FIELD")]
         public void BindsSnakeCaseClassFields(string originalFieldName, string snakeCaseFieldName)
         {
             using var obj = new SnakeCaseNamesTesClass().ToPython();

src/runtime/ClassManager.cs

@@ -517,7 +517,7 @@ private static ClassInfo GetClassInfo(Type type, ClassBase impl)
                         ci.members[mi.Name] = ob.AllocObject();
 
                         var pepName = fi.Name.ToSnakeCase();
-                        if (fi.IsLiteral || fi.IsInitOnly)
+                        if (fi.IsLiteral)
                         {
                             pepName = pepName.ToUpper();
                         }