feat: Add custom username and avatar define in discord tool (#9514)

api/core/tools/provider/builtin/discord/tools/discord_webhook.py

             return self.create_text_message("Invalid parameter content")
 
         webhook_url = tool_parameters.get("webhook_url", "")
-
         if not webhook_url.startswith("https://discord.com/api/webhooks/"):
             return self.create_text_message(
                 f"Invalid parameter webhook_url ${webhook_url}, \
         headers = {
             "Content-Type": "application/json",
         }
-        params = {}
         payload = {
+            "username": tool_parameters.get("username") or user_id,
             "content": content,
+            "avatar_url": tool_parameters.get("avatar_url") or None,
         }
 
         try:
-            res = httpx.post(webhook_url, headers=headers, params=params, json=payload)
+            res = httpx.post(webhook_url, headers=headers, json=payload)
             if res.is_success:
                 return self.create_text_message("Text message was sent successfully")
             else:

api/core/tools/provider/builtin/discord/tools/discord_webhook.yaml

       pt_BR: Content to sent to the channel or person.
     llm_description: Content of the message
     form: llm
+  - name: username
+    type: string
+    required: false
+    label:
+      en_US: Discord Webhook Username
+      zh_Hans: Discord Webhook用户名
+      pt_BR: Discord Webhook Username
+    human_description:
+      en_US: Discord Webhook Username
+      zh_Hans: Discord Webhook用户名
+      pt_BR: Discord Webhook Username
+    llm_description: Discord Webhook Username
+    form: llm
+  - name: avatar_url
+    type: string
+    required: false
+    label:
+      en_US: Discord Webhook Avatar
+      zh_Hans: Discord Webhook头像
+      pt_BR: Discord Webhook Avatar
+    human_description:
+      en_US: Discord Webhook Avatar URL
+      zh_Hans: Discord Webhook头像地址
+      pt_BR: Discord Webhook Avatar URL
+    form: form