Refactor CookieLocaleResolver

At present, CookieLocaleResolver extends CookieGenerator instead of
AbstractLocale(Context)Resolver like other LocaleResolver
implementations. This means it duplicates some common aspects of
LocaleResolver hierarchy while also exposing some CookieGenerator
operations, such as #addCookie and #removeCookie.

Additionally, CookieGenerator's support for writing cookies is based
on Servlet support which at current baseline doesn't support SameSite
directive.

This commit refactors CookieLocaleResolver to make it extend
AbstractLocaleContextResolver and also replaces CookieGenerator's
cookie writing support with newer and more capable ResponseCookie.
Simplify creation of CookieLocaleResolver with custom cookie name

This commit introduces CookieLocaleResolver constructor that accepts
cookie name thus allowing for a simpler creation of an instance with
the desired cookie name.

See gh-28779

spring-web/src/main/java/org/springframework/web/util/CookieGenerator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,13 +30,12 @@ import org.springframework.util.Assert;
  * given response.
  *
  * <p>Can serve as base class for components that generate specific cookies,
- * such as CookieLocaleResolver and CookieThemeResolver.
+ * such as CookieThemeResolver.
  *
  * @author Juergen Hoeller
  * @since 1.1.4
  * @see #addCookie
  * @see #removeCookie
- * @see org.springframework.web.servlet.i18n.CookieLocaleResolver
  * @see org.springframework.web.servlet.theme.CookieThemeResolver
  */
 public class CookieGenerator {