Dario Mirovic 9f4344a435 utils/reusable_buffer: accept non-throwing writer callbacks via result_with_exception ...

Make make_bytes_ostream and make_fragmented_temporary_buffer accept
writer callbacks that return utils::result_with_exception instead of
forcing them to throw on error. This lets callers propagate failures
by returning an error result rather than throwing an exception.

Introduce buffer_writer_for, bytes_ostream_writer, and fragmented_buffer_writer
concepts to simplify and document the template requirements on writer callbacks.

This patch does not modify the actual callbacks passed, except for the syntax
changes needed for successful compilation, without changing the logic.

Refs: #24567

2025-07-17 16:40:02 +02:00

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