Add gitlens as activity bar item instead of panel in explorer item

[PixelT]

More details about this:
https://code.visualstudio.com/updates/v1_23#_extension-authoring

[eamodio]

I thought about going down this route (and maybe I will in the future), but my plan is to move GitLens into the SCM activity. I originally thought that I could make it a user choice, but currently that really isn't possible with the provided apis/structures.

Hopefully moving to the SCM view is an acceptable compromise.

[MattSturgeon]

I'm in favour of git lens being either integrated into the Source Control view or its own view using the new 1.23 API. Either way it doesn't make much sense to me being in the Explore view.

I think it could look rather neat if it was in the SC view, but I have no idea how difficult this is compared with having its own view.

[eamodio]

I should have noted that this is a duplicate of #213 which is where the work is being done.

@MattSturgeon GitLens will be integrated into the Source Control activity. There is already a beta release with this support. As for not making much sense being in the Explorer activity -- unfortunately until vscode 1.23 that was the ONLY place extensions were able to add views.

[github-actions]

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