EditForm: change API to allow form subission from code

Is there an existing issue for this?

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Is your feature request related to a problem? Please describe the problem.

Currentyle, it seems there's no way to submit an EditForm programatically from C# code because the HandleSubmitAsync method is private.

Describe the solution you'd like

Adding a public method that submits the form would allows us to have forms without submit buttons (ex.: scenario where the user must pick items from lists and where picking an item should submit a form) and would allow us to reuse the context+validation logic currently implemented by the EditForm.

Additional context

No response