feat(backend): SPSPRouteError

[mkurapov]

Changes proposed in this pull request

• The SPSP middleware & SPSP routes are technically in the Open Payments routes, and as a result, to standardize how we handle all of the logging/error handling in Open Payments, I updated the middleware to throw a new SPSPRouteError instead of directly calling ctx.throw. This is then handled like any error thrown in the Open Payments routes/middleware

Context

Related to #1905

Checklist

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

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