Add experimental GK CLI integration

[eamodio]

Description

We are exploring an experimental integration with the GK CLI (support in the CLI should be landing soon) to be able to execute GL commands directly from the terminal and affect the current window.

[eamodio]

Can be enabled by setting "gitlens.gitKraken.cli.integration.enabled": true

The currently supported commands are:

gk gl cherry-pick
gk gl compare <ref1> <ref2>
gk gl graph <ref>
gk gl merge <ref>
gk gl rebase <ref>

[github-actions]

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