Makes operator to use string_view

src/operators/detect_sqli.h

@@ -32,8 +32,9 @@ class DetectSQLi : public Operator {
             m_match_message.assign("detected SQLi using libinjection.");
         }
 
-    bool evaluate(Transaction *t, RuleWithActions *rule,
-        const std::string& input,
+    bool evaluate(Transaction *transaction,
+        RuleWithActions *rule,
+        const bpstd::string_view &input,
         RuleMessage *ruleMessage) override;
 };