add support for TogetherAI (#1890)

### What problem does this PR solve?

#1853 add support for TogetherAI

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Zhedong Cen <cenzhedong2@126.com>
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

conf/llm_factories.json

@@ -2443,6 +2443,13 @@
                 }
             ]
         },
+        {
+            "name": "TogetherAI",
+            "logo": "",
+            "tags": "LLM,TEXT EMBEDDING,IMAGE2TEXT",
+            "status": "1",
+            "llm": []
+        },
         {
             "name": "PerfXCloud",
             "logo": "",
@@ -2594,6 +2601,6 @@
                     "model_type": "embedding"
                 }
             ]
-        }  
+        }
     ]
 }