Benchmarks for applying QueryParams in parseRequestURL function

```shell
% go test -benchmem -bench=. -run=^Benchmark
goos: darwin
goarch: amd64
pkg: github.com/go-resty/resty/v2
cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
Benchmark_parseRequestURL_QueryParam-16           663658              1806 ns/op             496 B/op         15 allocs/op
PASS
ok      github.com/go-resty/resty/v2    2.491s
```

middleware_test.go

@@ -271,3 +271,27 @@ func Benchmark_parseRequestURL_PathParams(b *testing.B) {
 		}
 	}
 }
+
+func Benchmark_parseRequestURL_QueryParams(b *testing.B) {
+	c := New().SetQueryParams(map[string]string{
+		"foo": "1",
+		"bar": "2",
+	}).SetQueryParams(map[string]string{
+		"foo": "3",
+		"xyz": "4",
+	})
+	r := c.R().SetQueryParams(map[string]string{
+		"foo": "5",
+		"qwe": "6",
+	}).SetQueryParams(map[string]string{
+		"foo": "7",
+		"asd": "8",
+	})
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		r.URL = "https://example.com/"
+		if err := parseRequestURL(c, r); err != nil {
+			b.Errorf("parseRequestURL() error = %v", err)
+		}
+	}
+}