Split project into multiple crates

[ppoliani]

We've had this discussion here already #24. With the addition of version checks I realized that it makes sense to split the crates for the purpose of proper versioning.

Changes to the admin cli are independent from the user cli tool. Thus we would need to keep different versions and having a single crate does not help.

[ppoliani]

@mimoo do you think we can re-open #24?

[mimoo]

I think before that would happen we would need to move the code that's in the CLI to the internal functions (I haven't had the time to clean up the code I added within the CLI commands that really don't belong there :D)

if you're interested in tackling this feel free to push a PR! Otherwise I'll try to find some time this week end

[ppoliani]

I just checked the commits. I believe you've done some work around this, right?

[mimoo]

we discussed with @imikushin and agreed to postpone this as it's not urgent work, but I agree that we should tackle this at some point