feat: add condition for min node version

[szymonrybczak]

Summary:

Closes #1768

Test Plan:

1. Clone the repository and do all the required steps from the Contributing guide
2. Download old version of node e.g. v12.22.12
3. Run node packages/cli/build/bin.js start inside repo and, you should get an error You need at least Node 14 to run CLI.

[thymikee]

I think it's weird that npx doesn't respect engines entry in package.json. Until it does, I'm good with this check, just let's make it less of a perf impact

[thymikee]

Can you confirm this still works after extra imports? Ideally we'd have a test for that but It may be tricky to come up with a good one. Mocking process.version will not take module resolution into account and otherwise we'd need to run this through node@12

[szymonrybczak]

Yeah, I tested that with node@12 and it still works 😄