[API Proposal]: Implement IUtf8SpanParsable<T> on Guid

[neon-sunset]

Background and motivation

Currently, Guid does not implement IUtf8SpanParsable<T>.

It is not uncommon to parse values of such type from UTF-8 bytes sourced from network streams, files and etc. directly, making it a reasonable expectation to be able to do this given it implements IUtf8SpanFormattable for the opposite operation.

API Proposal

namespace System.Collections.Generic;

public partial struct Guid : IUtf8SpanParsable<Guid>
{
    public static Guid Parse(ReadOnlySpan<byte> utf8Text, IFormatProvider? provider);
    public static bool TryParse(ReadOnlySpan<byte> utf8Text, IFormatProvider? provider, out Guid result);
}

API Usage

var text = "89042d67-7fd5-4d7c-8baa-7fe672b2f123"u8;
var guid = Guid.Parse(text);

Alternative Designs

Use existing Utf8Parser.TryParse(bytes, out Guid value, out int bytesConsumed).

Risks

N/A

[Rob-Hague]

I think it's (approved and) tracked by #81500 (comment)

[neon-sunset]

Right, so there's an umbrella issue for this. Thanks!