Convert LanguageNegotiation plugin discovery to attributes

Problem/Motivation

In #3252386: Use PHP attributes instead of doctrine annotations we added support for attribute based plugin discovery.
As part of that issue we converted block and action plugins.

This issue is to convert \Drupal\language\Annotation\LanguageNegotiationplugins to use Attributes.

Proposed resolution

1. Add a class to represent the new Attribute - Example
2. Update the plugin manager constructor to include both the attribute and annotation class names - example
3. Convert all plugins that use the annotation to use the new attribute - example

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet