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part of https://github.com/neondatabase/neon/issues/7124 Changes ------- This PR replaces the `EphemeralFile::write_blob`-specifc `struct Writer` with re-use of `owned_buffers_io::write::BufferedWriter`. Further, it restructures the code to cleanly separate * the high-level aspect of EphemeralFile's write_blob / read_blk API * the page-caching aspect * the aspect of IO * performing buffered write IO to an underlying VirtualFile * serving reads from either the VirtualFile or the buffer if it hasn't been flushed yet * the annoying "feature" that reads past the end of the written range are allowed and expected to return zeroed memory, as long as one remains within one PAGE_SZ