[Feature] Add temp_scaled_logprobs and top_p_normalized_logprobs parameters for logits and logprobs post processing (#3552)

* [feature] Add temp_scaled_logprobs and top_p_normalized_logprobs parameters for logits and logprobs post processing

* infer engine support temp_scaled_logprobs and top_p_normalized_logprobs

* delete some code

* code check

* code check and add doc

* fix tokenizer.decoder(-1), return 'Invalid Token'

* add ci for temp_scaled and top_p logprobs

* check test

* check seq len time shape

* logprob clip inf

---------

Co-authored-by: sunlei1024 <sunlei5788@gmail.com>

docs/online_serving/README.md

@@ -45,8 +45,9 @@ curl -X POST "http://0.0.0.0:8188/v1/chat/completions" \
 -H "Content-Type: application/json" \
 -d '{
   "messages": [
-    {"role": "user", "content": "Hello!"}, "logprobs": true, "top_logprobs": 5
-  ]
+    {"role": "user", "content": "Hello!"}
+  ],
+  "logprobs": true, "top_logprobs": 0,
 }'
 ```
 
@@ -193,6 +194,12 @@ max_streaming_response_tokens: Optional[int] = None
 
 disable_chat_template: Optional[bool] = False
 # Whether to disable chat template rendering, using raw input directly (default False means template is enabled).
+
+temp_scaled_logprobs: Optional[bool] = False
+# Whether to divide the logits by the temperature coefficient when calculating logprobs (default is False, meaning the logits are not divided by the temperature coefficient).
+
+top_p_normalized_logprobs: Optional[bool] = False
+# Whether to perform top-p normalization when calculating logprobs (default is False, indicating that top-p normalization is not performed).
 ```
 
 ### Differences in Return Fields