- adds command palette action

This is an ugly hack, but node-fetch doesn't seem to be able to pass `rejectUnauthorized` through on the request options properly even though we are creating a HTTPS agent with it set

Adds autolink configure command to autolinked issues & prs node

Adds line fading option to heatmap annotation

And separates the existing Gerrit provider to a new GoogleSource one.

Closes #1953

This reverts commit 2db3ae4378.

Honors `git.repositoryScanMaxDepth` if not overridden

Refs: #1869

Refs: #1886