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>

proto/zitadel/resources/user/v3alpha/user_service.proto

@@ -1392,7 +1392,7 @@ message SetContactPhoneRequest {
 message SetContactPhoneResponse {
   zitadel.resources.object.v3alpha.Details details = 1;
   // The phone verification code will be set if a contact phone was set with a return_code verification option.
-  optional string email_code = 3 [
+  optional string verification_code = 3 [
     (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
       example: "\"SKJd342k\"";
     }