[New feature] Manage command configuration

[bhou]

Add a new type of command launcher managed resource: "config". Each command can request to such configurations in requestedResources property.

A package should also declare the list of configurations it requires so that the command launcher can provide a proper interface to access them.

Example manifest:

pkgName: demo-pkg
version: 1.0.0
cmds:
  - name: test-cmd
     type: executable
     requiredResources: [ 'CONFIG_NAME_1', 'CONFIG_NAME_2' ]

configs:
  - name: NAME_1
    type: string
    default: hello
  - name: NAME_2
     type: integer
     default: 10

[dufrannea]

Maybe a small extension to this issue:
I have a command that requires two environment variables to be run, MYCOMMAND_USER and MYCOMMAND_APIKEY (MYCOMMAND_APIKEY is a secret value).
I wonder if it would make sense for command launcher to be able to store such values securely, what do you think ?

[jdevera]

Would this mean the values can be set up using the config command and that the storage would be managed by the launcher?
If so, and if the interface is env vars, then I think there would be some checks for clashes or some implicit namespacing.