Add shell integration injection for command prompt

[Tyriar]

It's relatively easy to get most of the way there with an injected profile:

Create a .cmd file:

@echo off
PROMPT $e]133;D$e\$e]133;A$e\$e]9;9;$P$e\$P$G$e]133;B$e\

Create a custom profile:

    "Command Prompt": {
      "path": [
        "${env:windir}\\Sysnative\\cmd.exe",
        "${env:windir}\\System32\\cmd.exe"
      ],
      "args": [
        "/K",
        "C:\\Users\\Daniel\\shellIntegation.cmd",
      ],
      "icon": "terminal-cmd"
    },

This gets us here:

To get the items to light up there are two approaches:

• See if we have a hook to be about to clear %errorlevel% which seems to contain error status for cmd. If so, use that as the exit code in the D sequence.
• If that's not possible, we can create a sequence that says to treat the D sequence without an exit code as a full command.

[Tyriar]

After investigating this with @anthonykim1, here are the findings:

• This mostly works:

  "terminal.integrated.env.windows": {
    "PROMPT": "$e]133;C$e\\$e]133;D;0$e\\$e]133;A$e\\$e]9;9;$P$e\\$P$G$e]133;B$e\\"
  },
  

• We tried:

  `$env:PROMPT = "`$e]133;C`$e\`$e]133;D;%errorlevel%`$e\`$e]133;A`$e\`$e]9;9;`$P`$e\`$P`$G`$e]133;B`$e\"`
  

  but errorlevel isn't an environment variable, so you can't do that.

Since we can't get the C sequence and there's no real preexec hook, I don't think it's worth trying to get this working as it's extremely basic anyway so we're just get more "bugs" reported in the end. Let's close as out of scope.