Add new keyboard shortcut to get the permalink version of a file
Motivation:
When we want to reference a file of the repository in a comment we usually want to use the permalink version (the one that includes the SHA in the URL), that way every time a visitors comes in the content of the referenced file will be the same
Expected:
When viewing the content of a file and pressing the y
keyword it should redirect us from a URL like https://gitlab.com/namespace/project/blob/master/lib/rugged/attributes.rb
to https://gitlab.com/namespace/project/blob/1962403d0b2f11fd55b7bd570db72690c2eb9db8/lib/rugged/attributes.rb
It should also honor the select line or range of lines, for instance, if the original URL is https://gitlab.com/namespace/project/blob/master/lib/rugged/attributes.rb#L22
it should redirect to https://gitlab.com/namespace/project/blob/1962403d0b2f11fd55b7bd570db72690c2eb9db8/lib/rugged/attributes.rb#L22