Create way to self update CLI tool

[tgadam]

Create way to self update CLI tool by querying GitHub repo releases for latest version and downloading and replacing existing exe. Depends on #58

[tnrich]

I'm imagining that a possible way to do this would be to add a self-update check each time the CLI tool is ran to first see if there is a more recent version that should be getting used instead (kind of like brew on a mac). This could add a slight delay to the command and also would mean that having internet access might be required for running the CLI tool.

[tgadam]

I think it's fine to require internet access to check for updates as long as we make that auto checking for updates a preference users can configure.

[eabeliuk]

OClif provides some functionality to update the corresponding installation package. As soon as we have the basic tooling to install packages, we might explore implementing this. For now, it has low priority.