connection status class

[leastbad]

Type of PR (feature, enhancement, bug fix, etc.)

Enhancement + Bug fix

Description

Moved the code responsible for handling Action Cable connection status classes on the DOM body from main SR initializer function to the Action Cable transport module. Brought AC consumer deprecation warning into the transport as well.

Refactored Action Cable transport module to call on a new connectionStatusClass function, reducing code repetition.

Created event listeners for turbolinks:load and turbo:load to run connectionStatusClass.

Renamed ActionCableTransport.set to ActionCableTransport.initialize.

Why should this be added

1. Separation of concerns and preparation for pluggable transport mechanisms in SR 4.
2. Fixes a bug where Turbo Drive would remove the body classes upon navigation.

Checklist

• My code follows the style guidelines of this project
• Checks (StandardRB & Prettier-Standard) are passing
• This is not a documentation update