Added types for Knowledgebase category
Added Troubleshooter Attachment methods
Added support for Knowledgebase category methods
Added integration test for knowledgebase category
Added support for Knowledgebase article methods
Added class definitions for KnowlegebaseAttachment and KnowledgebaseComment
Added Get/Delete methods for knowledgebase comments
Knowledgebase Comment Create method added
Knowledgebase Attachment support started
Knowledgebase attachment method support added