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/commands.go

@@ -34,6 +34,37 @@ func (a AddOrganization) Event(context.Context) eventsourced.Event {
 
 var _ eventsourced.Command = AddOrganization{}
 
+type AddUserToOrganization struct {
+	UserId    string
+	Initiator string
+}
+
+func (a AddUserToOrganization) Validate(_ context.Context, aggregate eventsourced.Aggregate) error {
+	if aggregate.Identity() == nil {
+		return fmt.Errorf("organization does not exist")
+	}
+	if len(a.UserId) == 0 {
+		return fmt.Errorf("userId is required")
+	}
+	// Check if user is already in the organization
+	org := aggregate.(*Organization)
+	for _, user := range org.Users {
+		if user == a.UserId {
+			return fmt.Errorf("user is already a member of this organization")
+		}
+	}
+	return nil
+}
+
+func (a AddUserToOrganization) Event(context.Context) eventsourced.Event {
+	return &UserAddedToOrganization{
+		UserId:    a.UserId,
+		Initiator: a.Initiator,
+	}
+}
+
+var _ eventsourced.Command = AddUserToOrganization{}
+
 type AddAPIKey struct {
 	Name      string
 	Key       string
@@ -79,6 +110,57 @@ func (a AddAPIKey) Event(context.Context) eventsourced.Event {
 
 var _ eventsourced.Command = AddAPIKey{}
 
+type RemoveAPIKey struct {
+	KeyName   string
+	Initiator string
+}
+
+func (r RemoveAPIKey) Validate(_ context.Context, aggregate eventsourced.Aggregate) error {
+	if aggregate.Identity() == nil {
+		return fmt.Errorf("organization does not exist")
+	}
+	org := aggregate.(*Organization)
+	found := false
+	for _, k := range org.APIKeys {
+		if k.Name == r.KeyName {
+			found = true
+			break
+		}
+	}
+	if !found {
+		return fmt.Errorf("API key '%s' not found", r.KeyName)
+	}
+	return nil
+}
+
+func (r RemoveAPIKey) Event(context.Context) eventsourced.Event {
+	return &APIKeyRemoved{
+		KeyName:   r.KeyName,
+		Initiator: r.Initiator,
+	}
+}
+
+var _ eventsourced.Command = RemoveAPIKey{}
+
+type RemoveOrganization struct {
+	Initiator string
+}
+
+func (r RemoveOrganization) Validate(_ context.Context, aggregate eventsourced.Aggregate) error {
+	if aggregate.Identity() == nil {
+		return fmt.Errorf("organization does not exist")
+	}
+	return nil
+}
+
+func (r RemoveOrganization) Event(context.Context) eventsourced.Event {
+	return &OrganizationRemoved{
+		Initiator: r.Initiator,
+	}
+}
+
+var _ eventsourced.Command = RemoveOrganization{}
+
 type UpdateSubGraph struct {
 	OrganizationId string
 	Ref            string