MudSignaturePad does not support required validation

[Aishwarya1821]

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The MudSignaturePad component does not support required field validation, which prevents marking the signature field as mandatory in forms. It would be beneficial to add support for required validation, similar to other form components.

Expected Behavior:

A property like Required="true" should be available for the MudSignaturePad component. If the signature is empty (i.e., no signature has been drawn), it should trigger a validation error when attempting to submit the form.