Samples and tests updated with relaxed final constraint for primary keys and properties

example/bin/myapp.dart

@@ -4,7 +4,7 @@ part 'myapp.g.dart';
 
 @RealmModel()
 class _Car {
- late final String make;
+ late String make;
  String? model;
  int? kilometers = 500;
  _Person? owner;

flutter/realm_flutter/example/lib/main.dart

@@ -26,7 +26,7 @@ part 'main.g.dart';
 
 @RealmModel()
 class _Car {
- late final String make;
+ late String make;
  String? model;
  int? kilometers = 500;
  _Person? owner;

test/realm_test.dart

@@ -31,7 +31,7 @@ part 'realm_test.g.dart';
 @RealmModel()
 class _Car {
  @PrimaryKey()
- late final String make;
+ late String make;
 }
 
 @RealmModel()
@@ -42,7 +42,7 @@ class _Person {
 @RealmModel()
 class _Dog {
  @PrimaryKey()
- late final String name;
+ late String name;
 
  late int? age;
 
@@ -52,14 +52,14 @@ class _Dog {
 @RealmModel()
 class _Team {
  late String name;
- late final List<_Person> players;
- late final List<int> scores;
+ late List<_Person> players;
+ late List<int> scores;
 }
 
 @RealmModel()
 class _Student {
  @PrimaryKey()
- late final int number;
+ late int number;
  late String? name;
  late int? yearOfBirth;
  late _School? school;
@@ -68,11 +68,11 @@ class _Student {
 @RealmModel()
 class _School {
  @PrimaryKey()
- late final String name;
+ late String name;
  late String? city;
- final List<_Student> students = [];
+ List<_Student> students = [];
  late _School? branchOfSchool;
- late final List<_School> branches;
+ late List<_School> branches;
 }
 
 String? testName;
@@ -402,7 +402,7 @@ Future<void> main([List<String>? args]) async {
 
  expect(() {
  realm.write(() {
- car.make = "Audi"; // setting late final is a runtime error :-/
+ car.make = "Audi";
  });
  }, throws<RealmUnsupportedSetError>());