feat: add commands for managing organizations and users

Introduce `AddUserToOrganization`, `RemoveAPIKey`, and 
`RemoveOrganization` commands to enhance organization 
management. Implement validation for user addition and 
API key removal. Update GraphQL schema to support new 
mutations and add caching for the new events, ensuring 
that organizations and their relationships are accurately 
represented in the cache.

domain/events.go

@@ -17,6 +17,24 @@ func (a *OrganizationAdded) UpdateOrganization(o *Organization) {
 	o.ChangedAt = a.When()
 }
 
+type UserAddedToOrganization struct {
+	eventsourced.BaseEvent
+	UserId    string `json:"userId"`
+	Initiator string `json:"initiator"`
+}
+
+func (a *UserAddedToOrganization) UpdateOrganization(o *Organization) {
+	// Check if user is already in the organization
+	for _, user := range o.Users {
+		if user == a.UserId {
+			return // User already exists, no need to add
+		}
+	}
+	o.Users = append(o.Users, a.UserId)
+	o.ChangedBy = a.Initiator
+	o.ChangedAt = a.When()
+}
+
 type APIKeyAdded struct {
 	eventsourced.BaseEvent
 	OrganizationId string   `json:"organizationId"`
@@ -34,6 +52,36 @@ func (a *APIKeyAdded) EnrichFromAggregate(aggregate eventsourced.Aggregate) {
 
 var _ eventsourced.EnrichableEvent = &APIKeyAdded{}
 
+type APIKeyRemoved struct {
+	eventsourced.BaseEvent
+	KeyName   string `json:"keyName"`
+	Initiator string `json:"initiator"`
+}
+
+func (a *APIKeyRemoved) UpdateOrganization(o *Organization) {
+	// Remove the API key from the organization
+	for i, key := range o.APIKeys {
+		if key.Name == a.KeyName {
+			o.APIKeys = append(o.APIKeys[:i], o.APIKeys[i+1:]...)
+			break
+		}
+	}
+	o.ChangedBy = a.Initiator
+	o.ChangedAt = a.When()
+}
+
+type OrganizationRemoved struct {
+	eventsourced.BaseEvent
+	Initiator string `json:"initiator"`
+}
+
+func (a *OrganizationRemoved) UpdateOrganization(o *Organization) {
+	// Mark organization as removed by clearing critical fields
+	// The aggregate will still exist in the event store, but it's logically deleted
+	o.ChangedBy = a.Initiator
+	o.ChangedAt = a.When()
+}
+
 type SubGraphUpdated struct {
 	eventsourced.BaseEvent
 	OrganizationId string  `json:"organizationId"`