refactor: move hrp/ to root folder

internal/pytest/main.go

@@ -0,0 +1,10 @@
+package pytest
+
+import (
+	"github.com/httprunner/funplugin/myexec"
+)
+
+func RunPytest(args []string) error {
+	args = append([]string{"run"}, args...)
+	return myexec.ExecPython3Command("httprunner", args...)
+}