As of #23867 this is now a real package, so updating the imports to
use the real package name, rather than relying on the alias. The
name change in the package name is because `I18n` is not a valid
name as NPM packages must be all lowercase.
This commit also introduces an eslint rule to prevent importing from
the old I18n path.
For themes/plugins, the old 'i18n' name remains functional.
- Moves `<ChatMessageInfo />` to `<Chat::Message::Info />`
- Moves `<ChatMessageAvatar />` to `<Chat::Message::Avatar />`
- Moves `<ChatMessageLeftGutter />` to `<Chat::Message::LeftGutter />`, adds tests
- Creates `<Chat::Message::Error />`
- Creates `<Chat::Message::MentionWarning />`, adds tests and a styleguide
- Creates a model for ChatMessageMentionWarning, adds fabricator for it
- Keeps the enter/leave viewport logic inside the `<ChatMessage />` component instead of bubbling it to the channel and thread components
- Adds a scale animation when clicking a reaction
- Creates `chat/later-fn` modifier which accepts a function and a delay. It allows to call a function Xms after a component has been inserted, it's useful for animations.
- Moves css code out of chat-message into relevant files
- Deletes unused code
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