[Feature Request] Expose EE usage and budget cap in statusline API similar to rate_limits

Description
The randomly appearing and disappearing message about EE quota usage isn't sufficient. People want to be able to display it in the same way that they present other information in the statusline. It'd be very helpful if that was made available in a way that is similar to rate_limits.five_hour, but returns the monthly usage + budget cap for the user so they can display it in whichever way they'd like (percentages, progress bar, just the value, etc).

Environment Info

• Platform: darwin
• Terminal: iTerm.app
• Version: 2.1.123
• Feedback ID: 71383dfd-ae99-4b9f-942a-6b64886a105a

Errors

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