feat: return outgoing-payment-with-spent-amounts from POST /outgoing-payment

[BlairCurrey]

Changes proposed in this pull request

• changes POST /outgoing-payment return type to new outgoing-payment-with-spent-amounts which extends existing outgoing-payment with new required fields grantSpentDebitAmount and grantSpentReceiveAmount.

Context

fixes: https://github.com/interledger/open-payments/issues/469

progress towards: https://github.com/interledger/rafiki/issues/2678

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🦋 Changeset detected

Latest commit: a5a04c7fbe9051771e92624c53bdbb54721e96c5

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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