feat(auth): use split auth specs in app

[njlie]

Changes proposed in this pull request

• Updates the AS to use the split openAPI specs.

Context

With the updated OpenAPI specs, this branch now suffers from https://github.com/interledger/rafiki/issues/630 Also, should be updated to use https://github.com/interledger/rafiki/pull/684 once it is merged in.

Checklist

• [ ] Related issues linked using fixes #number
• [ ] Tests added/updated
• [ ] Documentation added
• [ ] Make sure that all checks pass

[wilsonianb]

Also, should be updated to use https://github.com/interledger/rafiki/pull/684 once it is merged in.

I vote this waits for #684

[sabineschaller]

@njlie Can you please finish that now that #684 has been merged? I want to see if this solves my response must be null issue when requesting a grant.

[wilsonianb]

@njlie Want to open a pull request in https://github.com/interledger/open-payments removing/fixing whatever access restriction are causing problems (maybe just use the uniqueItems/maxItems for now), and update this to use the specs on main?

[njlie]

@njlie Want to open a pull request in interledger/open-payments removing/fixing whatever access restriction are causing problems (maybe just use the uniqueItems/maxItems for now), and update this to use the specs on main?

Sounds good.

@wilsonianb https://github.com/interledger/open-payments/pull/208