[9.x] Add Vite asset path generation method

[wilsenhc]

This PR adds a method to the Vite class so the the way the asset URLs are generated can be separated from the main class.

This would make it so Teams/Projects that have their own way of loading assets can extend the functionality of the Vite class and add their own method of loading assets.

This would ease the path of migrations from Laravel-Mix to Vite for those teams.

The assetPath() method has the same signature as the global asset() helper

[timacdonald]

Just note that the vite-plugin uses the ASSET_URL under the hood as well, so swapping this may not work as intended.

I'd recommend just setting the ASSET_URL in your different teams as needed.

[peterthomson]

I'd recommend just setting the ASSET_URL in your different teams as needed.

Just FYI, a delta between the asset URL and the physical folder can be weird, annoying and confusing. But it's the whole point of this (and similar optional customisations) in webpack / mix. For example shared hosting often has weird symlinks and rules around public folders. These types of customisations help the build pipeline for those developers.