Allow concurrent debug sessions for no-config debugging

[karthiknadig]

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.

[rchiodo]

I like option 2, pipes are always a pain.