feat: user v3 contact email and phone (#8644)

# Which Problems Are Solved

Endpoints to maintain email and phone contact on user v3 are not
implemented.

# How the Problems Are Solved

Add 3 endpoints with SetContactEmail, VerifyContactEmail and
ResendContactEmailCode.
Add 3 endpoints with SetContactPhone, VerifyContactPhone and
ResendContactPhoneCode.
Refactor the logic how contact is managed in the user creation and
update.

# Additional Changes

None

# Additional Context

- part of https://github.com/zitadel/zitadel/issues/6433

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/command/command.go

@@ -189,6 +189,9 @@ type AppendReducer interface {
 }
 
 func (c *Commands) pushAppendAndReduce(ctx context.Context, object AppendReducer, cmds ...eventstore.Command) error {
+	if len(cmds) == 0 {
+		return nil
+	}
 	events, err := c.eventstore.Push(ctx, cmds...)
 	if err != nil {
 		return err
@@ -196,6 +199,20 @@ func (c *Commands) pushAppendAndReduce(ctx context.Context, object AppendReducer
 	return AppendAndReduce(object, events...)
 }
 
+type AppendReducerDetails interface {
+	AppendEvents(...eventstore.Event)
+	// TODO: Why is it allowed to return an error here?
+	Reduce() error
+	GetWriteModel() *eventstore.WriteModel
+}
+
+func (c *Commands) pushAppendAndReduceDetails(ctx context.Context, object AppendReducerDetails, cmds ...eventstore.Command) (*domain.ObjectDetails, error) {
+	if err := c.pushAppendAndReduce(ctx, object, cmds...); err != nil {
+		return nil, err
+	}
+	return writeModelToObjectDetails(object.GetWriteModel()), nil
+}
+
 func AppendAndReduce(object AppendReducer, events ...eventstore.Event) error {
 	object.AppendEvents(events...)
 	return object.Reduce()