Create widget from factory

[trungleduc]

In the case of using existing widgets in FlexLayout dashboard, users can create multiple views of a widget, so all tabs are linked.

If users want to have the independent widget in each tab, FlexLayout allows users to define the factories to create widgets from the interface.

def slider_factory(label: 'Label of slider', value: 'Initial value'):
    return ipywidgets.FloatSlider(value=float(value), description=label )

factories = {"Slider factory": slider_factory}

dashboard = FlexLayout(factories=factories)

• If the factory function needs parameters, FlexLayout will build an input form to get parameters from the interface. Users can define annotations to have the label of the input form.

• FlexLayout will pass all parameters as string, users need to convert the inputs to their appropriate type in the factory function.

Close #17

[trungleduc]

cc @mtbli

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