Extend OpenApiAnyFactory to support array-type schemas and multivalued defaults

[jimfrederic]

Using 5.0.0-rc3, I had an Operation with a Parameter that was multivalued. I wanted to generate a swagger doc with a default for the parameter, and the default should be an array with a single value. However the OpenApiAnyFactory does not handle arrays. This PR adds that support.

As a result I can annotate my parameter

[DefaultValue(25)] int[] distance,

and it will now now generate

{
  "name": "distance",
  "in": "query",
  "description": "An array of distances",
  "schema": {
    "type": "array",  
    "items": {
      "type": "integer",
	  "format": "int32"
    },
    "default": [
      25
    ]
  }
}

[domaindrivendev]

Closing in favor of #1866