Rake task to setup internal unleash feature flags

Followup from !28980 (closed)

To setup the default internal unleash feature flags in local development you will need to have a project on your local instance that houses those flags. So a task must exist which:

1. Creates that project.
2. Creates the feature flags on that project (question: does this have to wait until feature flags are no longer gated behind a pay license?)
3. Set those flags to the correct default values.

For more context see these comments: !28980 (comment 338295259)