07116df541
51bd01b3ddfix(file_store): recover file offset after read (志宇)66dc34e75arefactor(file_store): Use BufReader but simplify (LLFourn)c871764670test(file_store): `last_write_is_short` (志宇)a3aa8b6682feat(file_store)!: optimize `EntryIter` by reducing syscalls (志宇) Pull request description: ### Description `EntryIter` performance is improved by reducing syscalls. The underlying file reader is wrapped with `BufReader` (to reduce calls to `read` and `seek`). Two new tests are introduced. One ensures correct behavior when the last changeset write is too short. The other ensures the next write position is correct after a short read. ### Notes to the reviewers This is extracted from #1172 as suggested by https://github.com/bitcoindevkit/bdk/pull/1172#pullrequestreview-1817465627. ### Changelog notice Changed * `EntryIter` performance is improved by reducing syscalls. ### Checklists #### All Submissions: * [x] I've signed all my commits * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md) * [x] I ran `cargo fmt` and `cargo clippy` before committing #### New Features: * [x] I've added tests for the new feature * [x] I've added docs for the new feature ACKs for top commit: LLFourn: ACK51bd01b3ddTree-SHA512: 9c25f9f2032cb2d551f3fe4ac62b856ceeb69a388f037b34674af366c55629a2eaa2b90b1ae4fbd425415ea8d02f44493a6c643b4b1a57f4507e87aa7ade3736