add disabled to Fieldset

[AnnMarieW]

Hi @snehilvj
Can we include this small update in the next release?
@MichaelODeli has the docs PR ready to merge after this is released as well 🎉

[AnnMarieW]

Here is a sample app to give it a try

import dash_mantine_components as dmc
from dash import Dash, _dash_renderer, Input, Output
_dash_renderer._set_react_version("18.2.0")

app = Dash(external_stylesheets=dmc.styles.ALL)


component = dmc.Fieldset(
    children=[
        dmc.TextInput(label="Your name", placeholder="Your name"),
        dmc.TextInput(label="Email", placeholder="Email"),
        dmc.Group(
            [
                dmc.Button('Send')
            ],
            justify='flex-end'
        )
    ],
    legend="Personal information",
    disabled = True,
    m=20
)


app.layout = dmc.MantineProvider([
    component
])

if __name__ == "__main__":
    app.run(debug=True)