Implement convenience traits

[MattesWhite]

First of all thank you for this crate. It works well and suits my use-case.

However, the handling is a little bit inconvenient. All conversions are done via From and TryFrom or new() constructors. As a result, I had to reference the docs a lot while programming.

Accordingly, I suggest to implement the usual convenience traits to improve the usability of iref, e.g. FromStr, ToOwned and AsRef.

I read that you want to wait for custom DSTs to land. However, the latest comments mentioned that the feature is not part of the 2021 roadmap. So I think its save to assume that the feature won't land for quite some time.

If you agree I would be glad to write a PR. I have a couple of more ideas to improve usability, e.g. using rustfmt and clippy, but for now that's enough.

[timothee-haudebourg]

Hi,

Thanks for the feedback. That seems like some good ideas, I'll be glad to take a look at your PR 😄

I read that you want to wait for custom DSTs to land

That's right, but that will be for a next major release, nothing stops us from improving this version without it.

using rustfmt and clippy

I don't mind, but I would prefer having those in a separate PR. The only condition I have is keeping the hard tabs for accessibility purposes by putting a .rustfmt.toml file with hard_tabs = true.