Features flag for sql/mongodb for query-engine is broken and non-existant in query-engine-node-api.

[chrismatteson]

Having the ability to compile a smaller binary or node API library is crucial for cold-start sensitive applications like serverless functions. It looks like there was an intention of including this functionality as it's partially included, but does not fully work to provide significantly reduced sizes.

[chrismatteson]

Created this pull request.

[Brendonovich]

I figure it's worth mentioning that this has already been addressed here, and is the reason that I maintain my own fork that supports enabling individual databases for query-core and migration-core that will be consumed by Prisma Client Rust 0.6.2