Update to Go 1.20 + run better align (#2927)

* chore(go): update go version to 1.20. Closes #2185

* chore(go): run better align against project

To optimize struct field order. Closes #2870

* chore(go): update CI jobs to use Go 1.20

* fix(go): linter warnings for Go 1.20 update

models/userJoinedEvent.go

@@ -4,8 +4,8 @@ import "time"
 
 // UserJoinedEvent represents an event when a user joins the chat.
 type UserJoinedEvent struct {
+	Timestamp time.Time `json:"timestamp,omitempty"`
 	Username  string    `json:"username"`
 	Type      EventType `json:"type"`
 	ID        string    `json:"id"`
-	Timestamp time.Time `json:"timestamp,omitempty"`
 }