Support rollup --configPlugin option

[ThePlenkov]

Hi!

I would like to use rollup.config.ts instead of rollup.conifg.js

Please notice that both rollup and vite projects are using rollup.config.ts in their source projects.

So according to documentation it should be possible by use of --configPlugin CLI option, which allows to preload plugin before parsing the config.

Unfortunately nx doesn't support this option which I think can be easily improved.