Allow to get_control by key

[albertas]

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Describe the requested feature

It would be very convenient to be able to get control by its key. It is possible to set unique control identifier by providing key in the arguments. However, it is not yet possible to retrieve the control by the key, control.uid has to be used instead, which requires Python variable creation and results in more code.

Suggest a solution

Existing get_control(id) method could be improved by allowing to provide id, or the key of control. https://flet.dev/docs/controls/page#get_controlid

Another option could be to add new method get_control_by_key(key) to the page.

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Additional details

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[ndonkoHenri]

The key property you see in Flet controls is meant for scrolling purposes (I even think we should rename it to scroll_key).