Clean up CldVideoPlayer and CldUploadWidget resources on:swap

[colbyfayock]

Astro makes available the astro:before-swap event that can allow us to clean up any resources prior to clientside page change.

https://docs.astro.build/en/guides/view-transitions/#astrobefore-swap

We should listen for the astro:before-swap event in the CldVideoPlayer and CldUploadWidget components, and when it fires, run the destroy method on the given widget instance.

Example in Next.js: https://github.com/cloudinary-community/next-cloudinary/blob/main/next-cloudinary/src/components/CldUploadWidget/CldUploadWidget.tsx#L135-L140