Add nodejs SDK

[seeflood]

What would you like to be added:
Add nodejs SDK for Layotto

Reference:
go-sdk: https://github.com/mosn/layotto/tree/main/sdk/go-sdk
java-sdk: https://github.com/mosn/layotto/tree/main/sdk/java-sdk
(java-sdk in main branch is very simple,there are several PRs waiting for review)
Also,u can take Dapr's nodejs sdk as reference.

Why is this needed:
Help nodejs programmers use Layotto

[seeflood]

This issue will be assigned to @fengmk2

[fengmk2]

This issue will be assigned to @fengmk2

:)

[fengmk2]

use nanoexpress for the http server https://github.com/nanoexpress/nanoexpress

[fengmk2]

use nanoexpress for the http server https://github.com/nanoexpress/nanoexpress

nanoexpress it deps cpp module, not the pure nodejs module. I will use fastily instead https://www.fastify.io/

[seeflood]

@fengmk2 Wait a minute,which type of server will you use fastily to start? A grpc server?
There may be some misunderstandings. Nodejs sdk should be a library for nodejs applications to import and it uses grpc to communicate with Layotto(sidecar),so it only need to start a grpc server.

But I just checked the grpc official document and found that there was an official nodejs lib to start a grpc server. Is that official lib not enough?
Sorry if I misunderstand something,since I'm not a nodejs pro.

[fengmk2]

@seeflood 抱歉。。。先看了 dapr 的文档，今天才看 layotto 的文档，才发现 layotto 完全是 grpc 或者 dubbo 的。忽略我的误解，本以为有 http api 可以先快速实现。我会使用 grpc 来做的，好多代码都不需要写了，自动生成。

[seeflood]

@fengmk2 恩恩大佬客气~
目前Layotto 只对外提供了grpc API，准备支持http api，并没有支持直接通过dubbo rpc调Layotto哈。dubbo那个例子 是通过grpc 调Layotto、Layotto转换成通过dubbo调别的dubbo服务~ 感觉文档讲的不够清楚，我完善下

[wenxuwan]

Hi @fengmk2 , i use tcp dump to catch the package between sdk and layotto ,from the picture, we can find sdk receive right package from layotto, but nodejs occur an error with Received RST_STREAM with code 1, may be there have some problem with nodejs grpc. Can u help check it ?