feat: add option to create outgoing payment from incoming payment

[BlairCurrey]

• changes spec and test to allow createing outgoing payment from incomingPaymentId/debitAmount instead of only quoteId

Changes proposed in this pull request

Context

fixes https://github.com/interledger/open-payments/issues/415

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🦋 Changeset detected

Latest commit: a19ba3fc8d36951c85cf0b7943aeaecfc19d7e1f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | -------------------------- | ----- | | @interledger/open-payments | Minor |

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[BlairCurrey]

converted to draft while i clarify some requirements (and most likely) update a few things to meet them.

EDIT: re-opening. should be good as-is.