Add MR comments on the code #15
Description
Add option to see the MR comments on the code itself.
A sign should appear in the sign bar for every comment from gitlab. When the user will stand on this line, the actual comment should appear in the command line of vim. The user should have an option to open the full comment in a preview window.
The sign (and color) will be different for resolved and unresolved comments. Whenever there will be more than one unresolved comment on a line, the sign that will be used will be the sign for unresolved comments.
This should also add a command to toggle the signs.