Improve Custom Event types

[colbyfayock]

Sounds like there's a potentially better way for handling CustomEvent types: https://stackoverflow.com/a/68783088

Is there room for improvement where we're using custom events for callbacks?

CldVideoPlayer: https://github.com/colbyfayock/astro-cloudinary/pull/2/files#diff-499428a7954282f9e77a1d76faecccf1a33effd72d8538bef205c3f048ff862fR133-R141

This should also help improve and clear up the types in the demos and examples, such as DemoVideoPlayerEvents.astro from the docs

Update example in Basic Usage to include new syntax

[aarya-16]

I could try and look into this @colbyfayock.

[sccalabr]

@colbyfayock how does this look?

[devpatocld]

@sccalabr, your PR is under review. Please be patient. Thank you!