llama: move suppress_tokens handling to common/sampling (#26276)

* llama: move suppress_tokens handling to common/sampling

* address security issues

* rm has_logit_bias

common/common.h

@@ -294,10 +294,6 @@ struct common_params_sampling {
 
     bool backend_sampling = false;
 
-    bool has_logit_bias() const {
-        return !logit_bias.empty();
-    }
-
     // print the parameters into a string
     std::string print() const;
 };