Add support for multi-file diff editor

[Igorgro]

Multi-file diff editor was added in Novemeber update and allows to view multiple diffs in one editor. Currently it allows to view diffs for uncommited and staged changes. It would be awesome if Gitlens added support for this editor for viewing commit changes.

[eamodio]

In the pre-release edition of GitLens, set "gitlens.experimental.openChangesInMultiDiffEditor": true and the Open All Changes and Open All Changes with Working Tree commands will use the multi-diff editor (assuming "multiDiffEditor.experimental.enabled": true is also set).

We're working on other changes as well which should land shortly, as well as having separate commands to open the multi-diff vs individual diffs -- the biggest blocker is how to concisely name both options 😄

[eamodio]

Now when you set "gitlens.experimental.openChangesInMultiDiffEditor": true you will see 2 additional options:

The Open All Changes and Open All Changes with Working Tree commands will use the multi-diff editor, while the others will use the previous behavior -- opening each file in a new diff editor.

[eamodio]

The setting is now gitlens.views.openChangesInMultiDiffEditor and it is enabled by default.

[github-actions[bot]]

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