Fix/ffi multiple query params

[rholshausen]

Added two new functions for setting up query parameters and headers. Supports JSON values with multiple values.

• pactffi_with_query_parameter_v2
• pactffi_with_header_v2

I.e.,

{
  "value": ["1", "2"], 
  "pact:matcher:type": "type", 
  "min": 1
}