Implement a full support for custom context path

[Haarolean]

https://webpack.js.org/guides/public-path/

[Mgrdich]

https://vitejs.dev/guide/build.html#public-base-path

when can configure this during build, by this parameter , if we can actually manage to pass the parameter during build.

but this is not on the fly url change solution , this won't cut it.

[Mgrdich]

vitejs/vite#3522