[Feature request] cleanup fileBody after successful response

Hi :)

Like we discussed on Tapir gitter it would be desirable for some use cases to have a way to cleanup/remove file provided as response body to an endpoint that declare out as fileBody, e.g. export endpoint that create temporary file that is no longer needed after an endpoint returned response.

Currently the only way that I managed to implement e2e is either:

• returning stream that will cleanup file on finish https://github.com/softwaremill/adopt-tapir/blob/main/backend/src/main/scala/com/softwaremill/adopttapir/starter/api/StarterApi.scala#L46
• convert file to byteStream and remove it in an endpoint logic explicitly .out(byteBufferBody and header("Content-Type", "text/csv"))

More context in this gitter thread: https://gitter.im/softwaremill/tapir?at=629dc6c4c61b987d33e59c2e

Start by comparing the fileBody response path with the linked adopt-tapir StarterApi.scala example, and review how the endpoint's out("fileBody") response is handled. The change is complete when a temporary file can be removed after a successful response without requiring callers to convert it to a byte stream or manage cleanup explicitly.