feat: add <git-ref> positional argument support to asdf plugin add
          #2167
        
          
      
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Summary
--asdf-plugin-gitrefargument so it works as expected.asdf plugin add, i.e.asdf plugin add <plugin-name> [<git-url>] [<git-ref>]giturl#gitrefas requested in Support plugin install giturl#gitref #1201, as it seemed simpler;#would require quoting the URL in some shells, and theasdf plugin update <plugin-name> [<git-ref>]pattern is already established.Fixes: #1201, #2131