feat: add http as sms provider (#8540)

# Which Problems Are Solved

Send SMS messages as a HTTP call to a relay, for own logic on handling
different SMS providers.

# How the Problems Are Solved

Add HTTP as SMS provider type and handling of webhook messages in the
notification handlers.

# Additional Changes

Clean up old Twilio events, which were supposed to handle the general
SMS providers with deactivate, activate and remove.

# Additional Context

Partially closes #8270

---------

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

internal/notification/handlers/config_sms.go

@@ -0,0 +1,52 @@
+package handlers
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/zitadel/zitadel/internal/api/authz"
+	"github.com/zitadel/zitadel/internal/crypto"
+	"github.com/zitadel/zitadel/internal/notification/channels/sms"
+	"github.com/zitadel/zitadel/internal/notification/channels/twilio"
+	"github.com/zitadel/zitadel/internal/notification/channels/webhook"
+	"github.com/zitadel/zitadel/internal/zerrors"
+)
+
+// GetActiveSMSConfig reads the active iam sms provider config
+func (n *NotificationQueries) GetActiveSMSConfig(ctx context.Context) (*sms.Config, error) {
+	config, err := n.SMSProviderConfigActive(ctx, authz.GetInstance(ctx).InstanceID())
+	if err != nil {
+		return nil, err
+	}
+
+	provider := &sms.Provider{
+		ID:          config.ID,
+		Description: config.Description,
+	}
+	if config.TwilioConfig != nil {
+		token, err := crypto.DecryptString(config.TwilioConfig.Token, n.SMSTokenCrypto)
+		if err != nil {
+			return nil, err
+		}
+		return &sms.Config{
+			ProviderConfig: provider,
+			TwilioConfig: &twilio.Config{
+				SID:          config.TwilioConfig.SID,
+				Token:        token,
+				SenderNumber: config.TwilioConfig.SenderNumber,
+			},
+		}, nil
+	}
+	if config.HTTPConfig != nil {
+		return &sms.Config{
+			ProviderConfig: provider,
+			WebhookConfig: &webhook.Config{
+				CallURL: config.HTTPConfig.Endpoint,
+				Method:  http.MethodPost,
+				Headers: nil,
+			},
+		}, nil
+	}
+
+	return nil, zerrors.ThrowNotFound(nil, "HANDLER-8nfow", "Errors.SMS.Twilio.NotFound")
+}