Have a variant of dbt --version for packages to help identify outdated packages

Describe the feature

dbt --version notifies you when there’s an updated version of dbt available to you. I’d love if there was an equivalent for packages (dbt --version packages?) which listed out each package (similar to #1236) but also checked the hub for updated versions.

Up to date:
  - fishtown-analytics/audit_helper 
      installed version: 0.3.0

  - fivetran/fivetran_log
      installed version: 0.3.1

Updates available:
  - fishtown-analytics/dbt_utils: 
      installed version: 0.6.6 
      latest version:    0.7.0

Update your versions in packages.yml, then run dbt deps

Additional context

• Not sure if/how this would work for packages loaded via git directly
• Not sure what should happen for packages installed via dependencies. E.g.
  • Should having calogica/dbt_expectations mean that calogica/dbt_date is shown? My guess: maybe
  • Should it show there’s an update available for dbt_date if it’s only installed via dependency? My guess: probably not - that’s for the dependency-creating package owner to deal with, and it’s probably not helpful to make people wonder how to update something they can’t control.

Who will this benefit?

People who would like the latest and greatest from their packages, but don’t want to manually go through the hub for their half-dozen different packages

Are you interested in contributing this feature?

Sure, given ample pointers!

[sungchun12]

@joellabes Feel free to take a look at the pull request, and let me know if the terminal output examples solve the issue you’re seeing!

[joellabes]

@sungchun12 I’m not likely to get to it in the next month or so, so if you want to jump in earlier then go for gold!