Allow concurrent debug sessions for no-config debugging

Currently DEBUGPY_ADAPTER_ENDPOINTS takes path to a file. This means that in the terminal we can only set path to a single file. Concurrent, connections can overwrite the file.

Considerations:
[Options PIPE] Make the file a PIPE. For this DEBUGPY_ADAPTER_ENDPOINTS should not be deleted by debugpy on exit.

[Option Folder] DEBUGPY_ADAPTER_ENDPOINTS could point to a folder. Debugpy, creates a temp file with random name and put the port number in it. We can monitor the folder for file creation and connect.

まず、DEBUGPY_ADAPTER_ENDPOINTS が設定なしのデバッグでどのように処理されるかを追跡します。提案されている pipe 方式と folder 方式を比較し、そのうえで、エンドポイントの上書きや早すぎる削除を発生させずに同時セッションをサポートできる方を判断します。完了条件は、同時接続を確実に確立できることです。