feat: Add onBreak handler to token price service

[Gudahtt]

Explanation

The CodefiTokenPricesServiceV2 service now accepts an onBreak event handler. This handler is called upon each circuit break. This allows us to collect metrics on circuit breaks, which would help is detect widespread failures of this service.

References

N/A

Changelog

@metamask/assets-controllers

• Added: Add onBreak option to CodefiTokenPricesServiceV2

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've highlighted breaking changes using the "BREAKING" category above as appropriate

[mcmire]

Looks good. I'm wondering if we should consider pulling this out so that all token price services get this behavior. Sahar is adding a function that can be called outside of the context of the controller here, so that might be a good place. But we can think about that later if it makes sense.

[Gudahtt]

We'd have to add a constructor to the abstract price service class to make that possible, and I'm not sure that would be worth the effort, especially since we only have one service in practice. The simple object type we use for it now is convenient for testing.

Edit: Oh, maybe you meant adding a "subscribeToBreak" method, something like that? Can't think of a reason why that would be useful. This was meant for tracking outages, which we only need to do in one place.