Allow statically build the API server

[nfroidure]

Currently, the server uses the DI loaders to run but we could build it like we do for the GCP Functions/AWS Lambda builds.

That said, this is a huge work, so this issue will gather all the necessary work/design to achieve it.

Testing:

cd packages/whook-example;
npm run build;
# Currently not working
node dist/start.js 

Still a few things to do:

• separate builds per NODE_ENV (linked to Split NODE_ENV to add an APP_ENV env var #123)
• manage the Knifecycle internals ($instance, $inject, $fatalError...) and decide to substitute or simply ignore it ( see Allow building with internal dependencies knifecycle#128 )
• decide the final interface of the build, maybe runServer like for the current build
• create a service for the 'HANDLERS' dependencies