Suggestion=> adjust :Copilot setup to accept an argument of "bindings"

I think it would he cool to have a couple of features added a new optional parameter under setup that created a file and appended it somewhere in your runtime path that contained only the various mappings of keys and allowed you to modify them

Another cool feature would be configure mappings where it launches an interpreter and captures input from stdin for ctrl + keys then stores them to a text file and reads from that to determine keybindings on a key by key basis. I had to write a really aggressive dismiss:
```
inoremap (copilot-dismiss):startinsertcall copilot#Dismiss()
```

Because for whatever reason whenever i would dismiss a suggestion it would immediately pop back up on the starts of new lines.
:Copilot version results:
copilot.vim 1.56.0
Vim 9.1.1244
GitHub Copilot Language Server 1.378.0
Node.js 22.20.0
Linux
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首先閱讀 issue 中關於為 :Copilot setup 新增選用引數，以及使用 inoremap 忽略建議的範例的請求。該 issue 沒有指出檔案或測試，並且將可設定的按鍵繫結與個別的忽略行為結合在一起；在開始工作之前，先釐清要實現的結果屬於哪個範圍。

由索引模型根據 Issue 內容生成。