tools.vpm: add support for ssh and hg version installations

[ttytm]

• Adds support for ssh installs e.g. v install git@github.com:vlang/libsodium.git.
• and for version installs (@<tag>) for modules using mercurial.

ssh is currently kind of supported. While at current master ssh modules CANNOT be installed via v install, v update CAN update such modules when adding an ssh module manually or changing the origin url of a module to an ssh address. But the update command has other issues. Adding (hopefully full) ssh support - before fixing the remaining known issues with the update command in a next step - will help keep the current functionality intact and make working with the ssh feature easier.

SSH CI tests are not added here, if git ssh is set up locally, it can be tested as follows:

# Assuming this is a clean install 
❯ v install git@github.com:vlang/vsl
...

# Checking the url it should be the installed ssh address
❯ git -C ~/.vmodules/vsl ls-remote --get-url
git@github.com:vlang/vsl
❯ git ls-remote --refs ~/.vmodules/vsl
2cdb2dc2968f1e84ce01635ba8d5aa5dd11ecbb8        refs/heads/main
2cdb2dc2968f1e84ce01635ba8d5aa5dd11ecbb8        refs/remotes/origin/HEAD
2cdb2dc2968f1e84ce01635ba8d5aa5dd11ecbb8        refs/remotes/origin/main

# Installing with a .git ending and a version should work as well
❯ v install git@github.com:vlang/vsl.git@v0.1.50
Scanning `git@github.com:vlang/vsl.git@v0.1.50`...
Module `vsl` is already installed at `~/.vmodules/vsl`.
Replace it with `vsl@v0.1.50`? [Y/n]: 
Installing `vsl`...
Installed `vsl`.

❯ git ls-remote --refs ~/.vmodules/vsl
2f2bcc961982668c8685e2d999eaeb6b50920fce        refs/tags/v0.1.50
❯ git -C ~/.vmodules/vsl ls-remote --get-url
git@github.com:vlang/vsl.git