Add support for Vagrant packages (#20930)

* Add support for Vagrant boxes.

* Add authentication.

* Add tests.

* Add integration tests.

* Add docs.

* Add icons.

* Update routers/api/packages/api.go

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: 6543 <6543@obermui.de>

templates/swagger/v1_json.tmpl

@@ -1962,7 +1962,8 @@
               "nuget",
               "pub",
               "pypi",
-              "rubygems"
+              "rubygems",
+              "vagrant"
             ],
             "type": "string",
             "description": "package type filter",