Node `transform()`

This release absorbs the 0.50 expressions snapshot, reframes compilers as Solid 2.0 packages, and fixes several divergences in Babel and native compiler lowering. Module-level "use server" exports now require direct function application.

SolidJS has absorbed the 0.50 expressions snapshot, refactoring compilers and runtimes into new monorepo packages. This release also includes fixes for compiler lowering divergences.