Reorganize host and component code

[vados-cosmonic]

Now that we're storing code for components and hosts in the repository, we should likely reorganize the code tree of the repository itself.

Some issues:

• We have a python host that should probably be close to the rust host (example-host assumes Rust, but we should probably have folders for different langauges)
• Components should be more consistently organized under a scheme like <language>/<tutorial name>, rather than what we have now (i.e. python/adder, js/adder, rust/calculator, etc)