support multi token for multi gitlab-site

I don't want to share my access token to any others so that I do not place the taken to the setting.json of workfolder so I have to place to my personal setting.json but there is only one token we can set, so, how about supporting multi-site within split token like:

"acid-gitlab-mr.accessToken": "xxxxxxxxxxxxxxxxxxxxxxxxxxx"

to:

"acid-gitlab-mr.accessToken": {
    "gitlab.com":"RRpYmoVR2tFsadsdas1yoMxkrVH",
    "privategitlab.com":"aaaaaaaaasadsdads"
}