API: add Source IP Block command

[hossinasaadi]

add Source IP Block command for clients. x-ui and ...
kinda help for ip restriction.

./xray api sib --server=127.0.0.1:62789 -outbound=blocked -inbound=socks5 -reset 127.0.0.1 1.1.1.1 ...

-outbound
	route traffic to specific outbound.
-inbound
	target traffig from specific inbound. Default Empty (All inbounds)
-ruletag
	set ruleTag. Default sourceIpBlock
-reset
	remove ruletag and apply new source IPs. Default false

#1317

[yuhan6665]

Haha I almost forgot why you added the routing API. Great work!

[RPRX]

只是问一下，似乎 #3189 也可以做到这件事？如果是的话，为此多加一项 API 的意义是？

[Fangliding]

@RPRX 方便他们的各种面板增删规则(?)
好像不少伊朗人想要灵活的限速/限制源IP/限流量这种用户控制的功能
说难听点 开机场 不过不像中国搓了xrayr和sspannel之类的一整套生态 他们好像更喜欢直接在核心上开(当然也可能是因为这部分的英文资料极度匮乏)
如果是issues大概会被直接轰走 pull request 就不好说啥了

[hossinasaadi]

@Fangliding
i know about implementing custom dispatcher but a lot of panels just running Xray binary.

@RPRX yes it does. far as i checked, a lot of clients asked for such option like this, so i decided to simplifying it by adding an API.

[yuhan6665]

确实从 api 设计的角度讲 应该设计成 parameterized 一个 command 解决所有问题
不过这个 pr 不修改 core 的任何文件 不增加维护成本 所以考虑到原作者需要就合了 :)

[Fangliding]

比起这些麻烦您们加feature的时候把文档都同步加一下（）