add_style api

[Lendemor]

code to test accordion, who use the new API along with data- vars from radix-ui

items = [
    rx.accordion.item(header="Item 1", content=rx.text("Item 1 content")),
    rx.accordion.item(header="Item 2", content=rx.text("Item 2 content")),
    rx.accordion.item(header="Item 3", content=rx.text("Item 3 content")),
]


@rx.page()
def index():
    return (
        rx.vstack(
            rx.hstack(
                rx.text("soft"),
                rx.text("classic"),
                rx.text("outline"),
                rx.text("ghost"),
                rx.text("surface"),
                spacing="9",
            ),
            rx.hstack(
                rx.accordion.root(*items, variant="soft"),
                rx.accordion.root(*items, variant="classic"),
                rx.accordion.root(*items, variant="outline"),
                rx.accordion.root(*items, variant="ghost"),
                rx.accordion.root(*items, variant="surface"),
            ),
            align="center",
            justify="between",
        ),
        rx.color_mode.button(position="top-right"),
    )

[Lendemor]

Need the pyi generator changes from #3186 before merging this

[picklelo]

looks good to me