Allow for multiple paths to validate

[erwinkramer]

In Spectral I'm able to configure this to allow multiple paths/files to be validated at once:

    "spectral.validateFiles": [
        "**/Specs.Generated/*.json",
        "**/.arazzo/*.yaml",
    ],

It seems there is only one file (or base) to be selected via Vacuum. Which forces me to put all files to be validated into the same subdirectory. This might make sense in simple setups, but having multiple types of specs (arazzo, openapi), that's usually in multiple folders, probably more scenarios like this.

[daveshanley]

fixing