Add formatter support for XML Plist + XML Mobileconfig files

[WardsParadox]

Description
Plist (in XML format, not binary) and MobileConfig files are just xml but because they are a separate "language" in vscode, XML Tools does not format

Current Workarounds
Switch document language to XML
OR
specify files.associations

  "files.associations": {
        "*.plist": "xml",
        "*.mobileconfig": "xml"
}

I use this extension hourly most days, having this ability would be really nice but is not any sort of priority due to the workarounds listed above.

EDIT:
Apparently, my brain decided to take a dumb and the grammar went with it. Fixed a few phrases in the sentences.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue is being automatically closed because it has not had recent activity. Thank you for your contributions.