CLI support for functional API

[jeromesimeon]

Description

Since Concerto 1.0.0-alpha, we have two validation APIs:

• "Object Style Validate": Type -> Data -> ValidatedData
• The experimental "Functional Style Validate": Type -> Data -> Boolean

The CLI only supports the former. It might be useful for testing / experimentation / usability to offer an option on the command line which would use the Functional Style validation.

[jeromesimeon]

Addressed in #246:

zsh-5.8$ more test.cto
namespace org.test

concept C identified by id {
        o String name
        o String id
}
zsh-5.8$ more test.json
{
    "$class": "org.test.C",
    "name": "John"
}
2:16:01 PM - INFO: Input is invalid
2:16:01 PM - ERROR: Instance org.test.C#undefined has an empty identifier.