feat:Use curl to encapsulate the Admin API into a script

[kasini3000]

Use curl to encapsulate the Admin API into a script.
Encapsulated into several functions.
For example:
add monitor, add route, add backend, etc. several functions.
It can be called by script name plus parameters.

[kasini3000]

从命令行，用脚本和参数控制apisix

功能需求：
从命令行
添加路由，
删除路由，
添加监听，
删除监听，
添加后端，
删除后端。

需求说明：
用户界面=命令行，参数。（类似于istioctl，kubectl）
我用webui，或dashboard去添加后端。是手动的，是http的。
我希望能通过命令行，实现这些功能。这样我可以不用安装ui。和能自动化。
程序内部，用脚本，用go语言的二进制程序，用其他语言的二进制程序，用curl把http转到命令行，我不关心。

我猜：
有一个命令接口，把网关，路由，后端这些信息，插入etcd数据库，对吗？
能否把接口封装好后，暴露出来给用户？
或对用户提供脚本，和参数。脚本内部通过curl，调用http://127.0.0.1/admin接口，
最终实现，上述【功能需求】。

如果，，，近期不考虑开发这个功能，也希望能够告知下，不要杳无音信。

[membphis]

@gxthrj do you have time to look at this issue?

[juzhiyuan]

Please take a look at this one, if we are going to support this?

[gxthrj]

@kasini3000 Sorry for the late reply. According to the stated configuration, calling APISIX admin-api is already supported, but the command line function still needs to be developed. I will list this in the plan, and I can first expose the functionality through the command line.
Because some functions overlap with other projects, I am doing this refactoring.

[gxthrj]

@kasini3000 Please take a look at apache/apisix-dashboard#1884, maybe what you want.

Apisix-control-plane hopes to make a yaml declarative configuration, and of course there will be command line tools.