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/templates/templateData.go

@@ -15,23 +15,23 @@ const (
 )
 
 type TemplateData struct {
-	Title           string
-	PreHeader       string
-	Subject         string
-	Greeting        string
-	Text            string
-	URL             string
-	ButtonText      string
-	PrimaryColor    string
-	BackgroundColor string
-	FontColor       string
-	LogoURL         string
-	FontURL         string
-	FontFaceFamily  string
-	FontFamily      string
+	Title           string `json:"title,omitempty"`
+	PreHeader       string `json:"preHeader,omitempty"`
+	Subject         string `json:"subject,omitempty"`
+	Greeting        string `json:"greeting,omitempty"`
+	Text            string `json:"text,omitempty"`
+	URL             string `json:"url,omitempty"`
+	ButtonText      string `json:"buttonText,omitempty"`
+	PrimaryColor    string `json:"primaryColor,omitempty"`
+	BackgroundColor string `json:"backgroundColor,omitempty"`
+	FontColor       string `json:"fontColor,omitempty"`
+	LogoURL         string `json:"logoUrl,omitempty"`
+	FontURL         string `json:"fontUrl,omitempty"`
+	FontFaceFamily  string `json:"fontFaceFamily,omitempty"`
+	FontFamily      string `json:"fontFamily,omitempty"`
 
-	IncludeFooter bool
-	FooterText    string
+	IncludeFooter bool   `json:"includeFooter,omitempty"`
+	FooterText    string `json:"footerText,omitempty"`
 }
 
 func (data *TemplateData) Translate(translator *i18n.Translator, msgType string, args map[string]interface{}, langs ...string) {