Custom presets for create-nx-workspace

[trumbitta]

Ref: https://nrwlcommunity.slack.com/archives/CMFKWPU6Q/p1632219143488700

It would be neat to have some way to use custom presets when creating a new workspace via create-nx-workspace.

My use case:
As we are planning to have third-parties create dozens of workspaces for dozens of clients using our software (of which react apps and Nx libs are just one part), we also want to enforce some conventional "subsystems" via our own (soon-to-be) published libs and plugins (i18n, l10n, auth, testing utils and patterns, some general utilities, etc).

I'm thinking being able to just choose a preset at creation time and have all of these libs / plugins ready to use would greatly smooth the adoption curve.

Without this feature, we'd only have plugins we'd require to install after the creation of the workspace. Which is fine, but I can see an improvement in developer experience here.

Thoughts?