Support next-rspack

[hardfist]

Problem Statement

according to user feedback vercel/next.js#77800, @nextjs/sentry is not compatible with next-rspack yet which blocks users trying using next-rspack, we(Rspack team) are willing to try to make it compatible with next-rspack if you're willing to accept changes.

Solution Brainstorm

detect running in next-rspack environment and try use related rspack api to implement functionality

[lforst]

Sure. Feel free to suggest changes!

[kevva]

I think this is magically working now. I was able to build with Rspack enabled at least which I wasn't able to before.