New interface for `reactpy.html`

[Archmonger]

Current Situation

Currently, we need to manually write every single HTML element that could exist. This is not efficient and is fairly annoying to maintain.

Proposed Actions

Create a generic that can automate this.

Here's an a draft implementation I made in a few minutes.

NO_CHILDREN_ALLOWED = {
    "area",
    "base",
    "br",
    "col",
    "command",
    "embed",
    "hr",
    "img",
    "input",
    "keygen",
    "link",
    "meta",
    "param",
    "source",
    "track",
    "wbr",
}

class HtmlConstructor:
    cache: dict[str, VdomConstructor] = {}

    def __getattribute__(self, value: str) -> VdomConstructor:
        if value.startswith("__") or value == "script":
            return super().__getattribute__(value)

        if value == "script":
            return _script

        if value in self.cache:
            return self.cache[value]

        self.cache[value] = make_vdom_constructor(
            value,
            allow_children=value not in NO_CHILDREN_ALLOWED,
        )

        return self.cache[value]


html = HtmlConstructor()

# Here's an example usage...
html.html(
    {"lang": "en"},
    html.head(
        html.title("Hello, world!"),
    ),
    html.body(
        html.h1("Hello, world!"),
        html.p("This is a paragraph."),
    ),
)