feat: Ability to add a button to close a dialog

[Thecrafterja]

This PR exposes the DialogPrimitive.Close as DialogClose to give the ability to use a button to close a dialog.

Code according to the solution discussed in this discussion #1030
Solution to issue #1029

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Latest commit: dd0744e

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[Thecrafterja]

Idea: Maybe the "Save Changes" button on the component page (https://www.shadcn-svelte.com/docs/components/dialog) should be inserted into a DialogClose element

[huntabyte]

Thank you!