Add Salesforce/XGen-7B-8K-Base to eval queue

Salesforce/XGen-7B-8K-Base_eval_request_False_False_False.json

@@ -0,0 +1 @@
+{"model": "Salesforce/XGen-7B-8K-Base", "base_model": "", "revision": "main", "private": false, "8bit_eval": false, "is_delta_weight": false, "status": "PENDING", "submitted_time": "2023-07-14T15:05:24Z"}