Support encoding/json/v2 struct tag options

[makkes]

The following code will raise the SA5008 check because the check doesn't support the new tag options that will be introduced with encoding/json/v2 (which is still experimental):

type Resource struct {
	Type ResourceType `json:"type,case:ignore"`
}

I wasn't able to find a way to add exceptions to SA5008 for specific tag options and I suppose it should just support those new options (there might be more than case, I'm not 100% sure).