Fix embedding missing, CORS and crash using verbose in server (#924)

* server: fix crash when prompt has image and is too long

* server: fix CORS

* server: fix empty result for embedding

* change error message to truncate prompt

* server: fix slot id for save and load state

* bug fix

* server: update slot similarity to handle mtmd

* server: quick hack to calculate number of token processed with image

* server: fix out of range error when detokenizing prompt under verbose

* Add back Access-Control-Allow-Origin

* Server: Add prompt tokens in embedding results

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Co-authored-by: firecoperana <firecoperana>

common/common.cpp

@@ -1741,7 +1741,6 @@ bool gpt_params_find_arg(int argc, char ** argv, const std::string & arg, gpt_pa
         return true;
     }
     if (arg == "--no-context-shift") {
-        CHECK_ARG
         params.ctx_shift = false;
         return true;
     }