Add WSL distro import related feature

[rkttu]

• Add a security warning dialog when load a tar-ball archive to import WSL distro.
  • Also, user can opt-out the warning message if want.
• When user drag .tar or tar.gz file into main window, automatically pops up a import window.

[JJDSNT]

Hi, would like to install and run wsl from a external hdd, is this about it?

https://craigloewen-msft.github.io/WSLTipsAndTricks/tip/install-different-drive.html