Add new behavior to `bbctl` to check for updates. ## Motivation `bbctl` has the ability to check if updates are available. To ease the burden on the users of `bbctl`, it should also have the ability to update itself if an update is available. ## Acceptance Criteria - Adds an optional configuration that enables auto-updating and automatically updates the local `bbctl` binary if a new version is available. - add configuration to `/.bbctl/config.yaml`, and update `bbctl config init` to reflect this - Use the logic implemented in https://repo1.dso.mil/big-bang/product/packages/bbctl/-/issues/293 to verify an update is available - `bbctl` can detect its own installation method of the supported update methods - If the installation method cannot be determined, `bbctl` must notify the user that an update is available and continue execution - If the installation method can be determined, `bbctl` must prompt the user asking if it's okay to update - If the user accepts the prompt, `bbctl` must update itself - If the user does not accept the prompt, `bbctl` must continue execution - If possible on the platform, the running `bbctl` process must replace itself with the updated version