feat: only poll for payment pointers in the open payments middleware

[mkurapov]

Changes proposed in this pull request

The function paymentPointerService.getByUrl was used in the remoteIncomingPayment service, when getting or creating a local or remote incoming payment, in order to determine whether the payment pointer URL provided was or wasn't a local payment pointer. This means, whenever we call "get receiver" or "create receiver", we end up having to wait for the function to poll for the payment pointer at the ASE. This adds a lot of extra overhead for cases where often, the receiver in question is at at another, remote Rafiki instance. I believe we should only end up polling for the payment pointer during open payments calls: meaning, only in the payment pointer middleware.

Context

• Related to feat: ask for payment pointer from ASE #1501

Checklist

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

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