Shannon Booth dc2c62825b LibURL: Add a representation of a URL Pattern 'result' ...

This is the return value of a URLPattern after `exec` is called on it.
It conveys information about the named (or unammed) regex groups
matched for each component of the URL. For example,

```
let p = new URLPattern({ hostname: "{:subdomain.}*example.com" });
const result = pattern.exec({ hostname: "foo.bar.example.com" });
console.log(result.hostname.groups.subdomain);
```

Will log 'foo.bar'.

2025-02-10 17:05:15 +00:00

..

Init.h

…

Pattern.h

…