feat(plugins): Implement event system w/ POC events

Implements the partially created event system with 3 events implemented as proof of concepts.

The 3 events are:
- `blacklistedIpBlocked`: emitted when a request from a blacklisted IP
- `accessRuleCreated`: emitted when a new access rule is created
- `blacklistToggled`: emitted when the blacklist is toggled for a given access rule

Why these events? Because these are the ones I forsee myself needing in the next version of the zoraxy_crowdsec_bouncer

Events are dispatched via a global event manager `plugins.EventSystem.Emit`

src/accesslist.go

@@ -10,6 +10,8 @@ import (
 	"github.com/microcosm-cc/bluemonday"
 
 	"imuslab.com/zoraxy/mod/access"
+	"imuslab.com/zoraxy/mod/plugins"
+	"imuslab.com/zoraxy/mod/plugins/zoraxy_plugin"
 	"imuslab.com/zoraxy/mod/utils"
 )
 
@@ -97,6 +99,17 @@ func handleCreateAccessRule(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// emit an event for the new access rule creation
+	plugins.EventSystem.Emit(
+		&zoraxy_plugin.AccessRuleCreatedEvent{
+			ID:               ruleUUID,
+			Name:             ruleName,
+			Desc:             ruleDesc,
+			BlacklistEnabled: false,
+			WhitelistEnabled: false,
+		},
+	)
+
 	utils.SendOK(w)
 }
 
@@ -359,6 +372,11 @@ func handleBlacklistEnable(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
+		plugins.EventSystem.Emit(&zoraxy_plugin.BlacklistToggledEvent{
+			RuleID:  ruleID,
+			Enabled: rule.BlacklistEnabled,
+		})
+
 		utils.SendOK(w)
 	}
 }