Add a `File::get_boxed_info_in` using `allocator_api`

[benpye]

It would be nice if we had a version of get_boxed_info that did not rely on the global allocator for use with the experimental feature allocator_api. I think there is sufficient support to return a boxed value with a specific allocator, specifically Box::from_raw_in.

I ended up writing this to use myself - I think it should look something like https://gist.github.com/benpye/b46a5d2ea1a0a59e037ae3522731d0e4

[phip1611]

@nicholasbishop I think we can solve this easily once #559 is merged. I assigned the issue to me.

[phip1611]

Btw, as we do not have a internal discussion platform, I do it here: @nicholasbishop did you notice that I've pinged you on https://gitter.im/rust-osdev/Lobby? It'd be great if you can help

@nicholasbishop @GabrielMajeri
Would it make sense to have a dedicated communication channel (signal, Telegram) or are discussions on github sufficient?

[GabrielMajeri]

@nicholasbishop @GabrielMajeri Would it make sense to have a dedicated communication channel (signal, Telegram) or are discussions on github sufficient?

Sorry, I haven't been able to catch up and help with uefi-rs lately because of schoolwork and some personal projects. We can use other communication channels, sure, but I'd be just as unresponsive there as I'm currently on GitHub 😅 so I don't necessarily see the point.

[nicholasbishop]

Thanks for the heads up, I didn't see that discussion on gitter.

Re a different communication channel, what about enabling Github Discussions on the repo? It's kinda similar to issues, but can encourage broader discussion than issues which tend to just get used for bug reports.

I prefer that over chats like gitter/discord/zulip, especially because it's searchable (gets indexed by Google etc) and makes it easier to respond when one has time as opposed to a live chat.

[phip1611]

Actually, I just wasn't sure where totally unrelated things like "please look on gitter.im" and similar messages should be. I also assume such messages are very rare. Yeah, maybe the github discussions feature is what we need and a chat group overkill + has other disadvantages