DatePicker renamed to DatePickerInput

[AnnMarieW]

This PR renames the DatePicker to DatePickerInput so the component name is aligned with the upstream Mantine library.
For more information see #410

Until the real DatePicker component is added, you will see an error message:

Here is a sample app to show the error message for the old component name, and that the new component works as expected

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

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

component = dmc.Stack(
    [
        dmc.DatePicker(
            value=datetime.now().date(),
            label="Date not clearable",
           # w=200,
        ),
        dmc.DatePickerInput(
            value=datetime.now().date(),
            label="Date clearable",
            w=200,
            clearable=True,
        ),
    ]
)


app.layout = dmc.MantineProvider(
    component
)

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

[AnnMarieW]

Docs PR here: snehilvj/dmc-docs#106

[github-actions]

Generated link: snehilvj/dash-mantine-components-414

[alexcjohnson]

💃 Looks good to me!