* Replace `futures-channel` with `async-channel` in `out_events`
* Apply suggestions from code review
Co-authored-by: Koute <koute@users.noreply.github.com>
* Also print the backtrace of `send()` call
* Switch from `backtrace` crate to `std::backtrace`
* Remove outdated `backtrace` dependency
* Remove `backtrace` from `Cargo.lock`
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Co-authored-by: Koute <koute@users.noreply.github.com>