add debug configuration for scripts with command-line arguments

Prerequisites

• I have written a descriptive issue title.
• I have searched all issues to ensure it has not already been reported.

Summary

There was a configuration in past for launching debugger for scripts with command-line arguments. It would be nice to have it back.

Proposed Design

  {
    "type": "PowerShell",
    "request": "launch",
    "name": "PowerShell Launch Current File w/Args Prompt",
    "script": "${file}",
    "args": [
      "${command:SpecifyScriptArgs}"
    ],
    "cwd": "${file}"
  },

No files or tests are named. Search the extension for the PowerShell debug launch configuration and the SpecifyScriptArgs command, then compare current handling with the proposed JSON. Done means restoring a launch configuration for the current script that accepts command-line arguments.