Ship as standalone executable to avoid Node.js runtime version dependency mismatches

[tinahollygb]

Currently users need to npm install the growthbook CLI while using Node version 16+ due to our dependency on oclif which uses standard library importing naming conventions introduced in newer versions. This means there will be a failure when trying to install on older versions.

Look into things like deno and bun that may be able to help with this (e.g. shipping a runtime with it)