JsonApprovals reorderJson is not compatible with customized GsonBuilder

[olsavmic]

The API (and implementation) of org.approvaltests.JsonApprovals.verifyJson does not provide a variant with reorderJson functionality and gsonBuilder parameter, resulting in unexpected changes of the output - fields are missing due to the default behavior of the GsonBuilder to skip NULL fields.

  public static void verifyJson(String json, boolean reorderJson);

  public static void verifyJson(String json, boolean reorderJson, Options options);

  // no way to configure both reorderJson = true and gsonBuilder

  public static void verifyAsJson(Object o, Function1<GsonBuilder, GsonBuilder> gsonBuilder);

  public static void verifyAsJson(Object o, Function1<GsonBuilder, GsonBuilder> gsonBuilder, Options options);

Btw I think that the API is not going to scale well with these different parameters.
I'd propose to merge the configuration parameters into a combined JsonOptions structure.

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Thank you for the tooling! I really appreciate such a zero-config snapshotting functionality :)