Conditional request execution support

[shadow1ng]

发送poc时，能否按顺序发包和匹配，而不是一开始就发送完所有包。
比如下面两个poc
https://github.com/projectdiscovery/nuclei-templates/blob/master/vulnerabilities/ruijie/ruijie-eg-rce.yaml
https://github.com/chaitin/xray/blob/master/pocs/ruijie-eg-cli-rce.yml

.\xray_windows_amd64.exe webscan --plugins phantasm --poc "ruijie-eg-cli-rce.yml" -u 127.0.0.1

使用xray时，会按poc规则顺序发包，如果第一个包匹配失败，就不会继续无效发包

nuclei -u http://127.0.0.1 -t vulnerabilities\other\ruijie-eg-rce.yaml -proxy http://127.0.0.1:8080

即使第一个数据包会匹配失败，但nuclei会一次性把所有包发完，再对他们进行匹配，导致nuclei浪费了很多发包，而且特征也更明显。

建议nuclei采用xray的poc规则流程，按顺序发包，从而减少无效发包。

[ehsandeep]

Translated version of the issue:

When sending poc, can the packets be sent and matched in order instead of sending all the packets at the beginning.
For example, the following two pocs
https://github.com/projectdiscovery/nuclei-templates/blob/master/vulnerabilities/ruijie/ruijie-eg-rce.yaml
https://github.com/chaitin/xray/blob/master/pocs/ruijie-eg-cli-rce.yml

.\xray_windows_amd64.exe webscan --plugins phantasm --poc "ruijie-eg-cli-rce.yml" -u 127.0.0.1

When using xray, the packets will be sent in the order of the poc rules. If the first packet fails to match, it will not continue to send invalid packets.

nuclei -u http://127.0.0.1 -t vulnerabilities\other\ruijie-eg-rce.yaml -proxy http://127.0.0.1:8080

Even if the first packet fails to match, nuclei will send all the packets at one time, and then match them, resulting in nuclei wasting a lot of packets, and the characteristics are more obvious.

It is recommended that nuclei adopts the poc rule process of xray to send packets in order, thereby reducing invalid packets.