OpenBMC：BmcWeb login认证

BmcWeb在include\login_routes.hpp中实现了/login用于完成web的登录：

BMCWEB_ROUTE(app, "/login")
    .methods(boost::beast::http::verb::post)(handleLogin);
    
inline void handleLogin(const crow::Request& req,
                        const std::shared_ptr& asyncResp)
{
    MultipartParser parser;
    std::string_view contentType = req.getHeaderValue("content-type");
    std::string_view username;
    std::string_view password;

    nlohmann::json loginCredentials;
    // Check if auth was provided by a payload
    if (contentType.starts_with("application/json"))
    {
        loginCredentials = nlohmann::json::parse(req.body(), nullptr, false);
        if (loginCredentials.is_discarded())