D: Convert/parse uint integer to string. (@nogc)

[BoQsc]

I tried to look into https://dlang.org/phobos/std_conv.html

Most of the functions inside `std.conv` seem to be dependant on 
[Garbage Collection](https://dlang.org/spec/garbage.html).

And I couldn't find a straightforward way to produce a `string` 
value out of `uint` value.

How to convert or parse `uint` value to a `string` in `@nogc` way?