[Feature Request] 支持多用户认证插件的配置 #42

Describe the feature request

我在frps端使用了多用户认证插件, https://github.com/gofrp/fp-multiuser
在frpc的配置认证如下, 第三行和第四行是认证信息, 能添加该认证支持吗?

serverAddr = "xxx"
serverPort = 7000
user = "frp001"
metadatas.token = "frp001pwd"
[[proxies]]
name = "TCP_4455"
type = "tcp"
localIP = "192.168.1.9"
localPort = 4455
remotePort = 6000

Describe alternatives you've considered

No response

Affected area

• Docs
• Installation
• Performance and Scalability
• Security
• User Experience
• Test and Release
• Developer Infrastructure
• Client Plugin
• Server Plugin
• Extensions
• Others