Suport method automatic parameter conversions

[joshka]

I'm of two minds on this on whether to shade the JsonP library.

Rather than having to manually pull keys and values out of a JsonObject parameter, It might be neat to support automatically filling parameters. E.g:

@ParameterizedTest
@JsonSource("{'itemA':'1','itemB':'2'}")
void test(int itemA, String itemB) {
  assertEquals(1, itemA);
  assertEquals("2", itemB);
}

This would require pulling the parameter names of the test method from the execution context, and a major version bump to 2.0.0 due to a non compatible change in the public interface.

[joshka]

Decided not to shade the library for now, as I assume a test dependency is usually fairly simple to satisfy (where a production one might be less so). I will do the other part of this (enable automatically filling parameters, but currently have to resort to annotations for this to work.

[joshka]

See #177