feat_req(html): check whether a html attribute is boolean according to the spec

**Is your feature request related to a problem? Please describe.**

I hope the pandora box wasn't opened with #5437, but I was hoping for some utilitary function that'd be able to tell if an html attribute for a given tagname is a boolean attribute or not.

Spec refs:
- https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#boolean-attribute
- https://html.spec.whatwg.org/#attributes-3

The second link is a table containing a list of tagname/attributes and allowed values which can be used as reference. It is complete enough to also implement other utilities function.

Why the focus on boolean attributes ?
- These can often be misused, because of how boolean attributes are handled in html: a falsy value is when it is omitted, while a truthy value is its presence (including empty value or its name itself)
- e.g. `disabled="false"` is actually treated as `disabled="disabled"` by most browsers, in addition to being technically incorrect
- Such a function could be used for simple linting/formatting/sanitizing/testing tools, helping when generating html templates, etc.
- It makes the scope relatively small for now if std thinks this can be in-scope for the html package

As the spec is well-defined, it wouldn't require much maintenance, while once again abstracting the complexity of the html spec for users.

**Describe the solution you'd like**

Something along:
```ts
isBooleanAttribute("VIDEO", "playsinline") // true
isBooleanAttribute("DIV", "playsinline") // false
```

**Describe alternatives you've considered**

There's [is-boolean-attribute](https://www.npmjs.com/package/is-boolean-attribute) but technically it's not compliant since it doesn't check the tagname