[feature] add rule feature

[nomeguy]

Rule should be added to CasWAF as first-class object (Go struct, CURD, list page, edit page, etc.)

Rule contains two parts: condition and an action.

Condition can be:

1. Always true
2. WAF rule matched
3. IP whitelist/blacklist
4. UA whitelist/blacklist
5. Composite conditions like requestUrl.startsWith("/attack") && method == "POST || WAF rule matched"

Action can be:

1. Pass or Block
2. Log or Not-log
3. Requires login (via Casdoor: https://casdoor.org/ )
4. Requires captcha (via Casdoor captcha provider: https://casdoor.org/docs/category/captcha/ )