MM-12855 Plugin Context (#9922)

* Basic plugin context.

* Adding more useful fields to plugin context.

* Fix spelling

Co-Authored-By: crspeller <crspeller@gmail.com>

* Fixing location of context creation.

app/plugin_requests.go

@@ -42,7 +42,12 @@ func (a *App) ServePluginRequest(w http.ResponseWriter, r *http.Request) {
 
 func (a *App) servePluginRequest(w http.ResponseWriter, r *http.Request, handler func(*plugin.Context, http.ResponseWriter, *http.Request)) {
 	token := ""
-	context := &plugin.Context{}
+	context := &plugin.Context{
+		RequestId:      model.NewId(),
+		IpAddress:      utils.GetIpAddress(r),
+		AcceptLanguage: r.Header.Get("Accept-Language"),
+		UserAgent:      r.UserAgent(),
+	}
 	cookieAuth := false
 
 	authHeader := r.Header.Get(model.HEADER_AUTH)