adds deprecation warnings to pack stack comands

[joe-kimmel-vmw]

Summary

adds deprecation warnings.

Output

Before

After

➜  pack git:(stackrecommenddepwarning) ✗ ./out/pack stack                                            
(Deprecated)
Stacks will continue to be supported through at least 2024 but are deprecated in favor of using BuildImages and RunImages directly. Please see our docs for more details- https://buildpacks.io/docs/concepts/components/stack

Usage:
  pack stack [command]

Available Commands:
  suggest     (deprecated) List the recommended stacks

Flags:
  -h, --help   help for stack

Global Flags:
      --no-color     Disable color output
  -q, --quiet        Show less output
      --timestamps   Enable timestamps in output
  -v, --verbose      Show more output

Use "pack stack [command] --help" for more information about a command.

and

➜  pack git:(stackrecommenddepwarning) ✗ ./out/pack stack suggest                                     
Stacks maintained by the community:

    Stack ID: Deprecation Notice
    Description: Stacks will continue to be supported through at least 2024 but are deprecated in favor of using BuildImages and RunImages directly. Please see our docs for more details- https://buildpacks.io/docs/concepts/components/stack
    Maintainer: CNB
    Build Image:
    Run Image:

    Stack ID: heroku-20
    Description: The official Heroku stack based on Ubuntu 20.04
    Maintainer: Heroku
    Build Image: heroku/heroku:20-cnb-build
    Run Image: heroku/heroku:20-cnb

    Stack ID: io.buildpacks.stacks.bionic
    Description: A minimal Paketo stack based on Ubuntu 18.04
    Maintainer: Paketo Project
    Build Image: paketobuildpacks/build:base-cnb
    Run Image: paketobuildpacks/run:base-cnb

    Stack ID: io.buildpacks.stacks.bionic
    Description: A large Paketo stack based on Ubuntu 18.04
    Maintainer: Paketo Project
    Build Image: paketobuildpacks/build:full-cnb
    Run Image: paketobuildpacks/run:full-cnb

    Stack ID: io.paketo.stacks.tiny
    Description: A tiny Paketo stack based on Ubuntu 18.04, similar to distroless
    Maintainer: Paketo Project
    Build Image: paketobuildpacks/build:tiny-cnb
    Run Image: paketobuildpacks/run:tiny-cnb

Documentation

this change is documentation

Related

Resolves #___