Create butter bar frontend for API usage notification

[zachaysan]

At the endpoint:

GET /api/v1/organisations/<int:organisation_pk>/api-usage-notification/

If there are no results then do not show the butter bar. If there are results that look like this.

[{
    "notified_at": "2023-01-19T09:09:47.325132Z",
    "organisation_id": 2232,
    "percent_usage": 100,
}]

Take the percent_usage value and include it into language that says something like "Your organisation has exceeded X% of its API usage quota"

If at 100% or higher, then check if they have a paid plan. If they have a paid plan add the following "automated billing for the overages may apply."

If, on the other hand, they have a free plan and at or higher than 100% then add the following "API access may be turned off unless your organisation upgrades."