Deploy compositions as part of aio app deploy

Currently, there is no way to deploy a composition using the aio cli. Instead, we need to manually install the `openwhisk-composer` package, set up environment variables (or a `.wskprops` file) and deploy manually.

What I'd like to happen is to be able to reference a composition's JS file in the manifest, and have it deployed with the rest of the application.
- Define the composition in a JS file somewhere (e.g. a `compositions` folder)
- Declare the composition in `app.config.yaml` - suggested format:
```yaml
runtimeManifest:
packages:
myPackage:
actions:
...
sequences:
...
compositions:
compositionA:
definition: src/compositions/compositionA.js
web: 'yes'
annotations:
require-adobe-auth: true
```

Being able to deploy all actions, sequences and compositions via a single command would be highly preferable, compared to the current situation, where a composition has to be deployed separately (and then updated to be web-accessible, etc. if desired)

Start by reading the proposed app.config.yaml runtimeManifest format and the referenced composition JS files. Compare the requested composition fields with the existing action and sequence deployment behavior; done means aio app deploy handles compositions alongside those resources, including the requested web setting and annotations.

Written by the indexing model from the issue text.