Publish the `rust-no-heap` crate on crates.io

[ivmarkov]

Background: I would've copy-pasted the code in the project, if it wasn't that the project is licensed under Apache 2.0 only, while the QR code is licensed under MIT only.

Also, I can publish the code myself (using a fork), but it just doesn't feel right. So if you are up for it, maybe two options:

• Option A: a qrcodegen-no-heap (or whatever name we come up with) crate next to the already published qrcodegen
• Option B: Get qrcodegen-no-heap and qrcodegen mixed into a single crate/project with two modules, where the qrcodegen module is conditionally enabled when the std feature of the project is enabled (and the std feature is - as usual - in the crate's default = ["std"] feature); the qrcodegen_no_heap module (or however you might decide to name it) would always be enabled, of course

[nayuki]

Done with option A. https://github.com/nayuki/QR-Code-generator/pull/181#issuecomment-1685357764 , https://crates.io/crates/qrcodegen-no-heap

[ivmarkov]

I can confirm that the newly-published crate works great - thanks a lot!