The (new in 0.22.0) articles.contentTagIds field has the wrong Type (is List<Long> - should be List<String>

[andy-may-at]

Describe the bug
When I added the field Articles.contentTagIds in this commit, I trusted the example responses in the Zendesk documentation & so added the field as a List<Long>

But it turns out that the articles API docs were wrong & the IDs are really String values (not Long)

Evidence:

The docs for the content_tags resource show it as a String.

And an example response from my Zendesk instance's Articles API has String values:

     "content_tag_ids": [
         "01GMAGH6KPDHEY79MN3S4H8V7D"
     ],

I would expect this bug to cause deserialisation errors when parsing article responses that contain content_tag_ids value

I'll get a PR to fix in ASAP.

[andy-may-at]

PR is here: #582