URL-encoded form data support

[ta7mid]

Having support for parsing percent-encoded (URL-encoded) key-value pairs using compile-time reflection in Glaze out of the box would increase its relevance to web back-end development as this format is used for encoding both URL query strings and POST request bodies (as application/x-www-form-urlencoded) sent through HTML forms.

Plus, there don’t seem to be many great C++ libraries for parsing percent-encoded key-value pairs anyway. Ada could be a notable exception – but it doesn’t use compile-time reflection, so the DX isn’t particularly great for validating and parsing URL-encoded form data into structs with many fields.

The parsing rules are quite simple, so it should be easy to implement?

[stephenberry]

I do agree this would be cool, and I'd be happy to review a pull request. Right now I'm trying to systematically work through all the open issues. So, this isn't a priority right now.

[stephenberry]

Support added in #2232