feat: add benchmark for string strip

benchmark/yycc/string/op.cpp

@@ -0,0 +1,18 @@
+#include <benchmark/benchmark.h>
+#include <yycc.hpp>
+#include <yycc/string/op.hpp>
+
+#define OP ::yycc::string::op
+using namespace std::literals::string_view_literals;
+
+namespace yyccbench::string::op {
+
+    static void StringStrip(benchmark::State& state) {
+        std::u8string_view strl = u8" \thello\r\n"sv, words = u8" \t\r\n"sv;
+        for (auto _ : state) {
+            auto rv = OP::strip(strl, words);
+        }
+    }
+    BENCHMARK(StringStrip);
+
+}