server: add exceed_context_size_error type #15780
                
     Merged
            
            
          
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Prepare for #14839
Added a new error type
exceed_context_size_errorWhen a request exceed slot context size, error response will now include the token count:
{ "error": { "code": 500, "message": "the request exceeds the available context size. try increasing the context size or enable context shift", "type": "exceed_context_size_error", "n_prompt_tokens": 1407, "n_ctx": 256 } }