feat(pds-ember): Migrate Addon from HCP

[CITguy]

Summary

• copy files from HCP into this repo
• tweak import paths to reflect new package name
• minor modifications to address accidental Storybook 6 upgrade
  • No major issues with v6, so we'll stick with it.
  • Console warnings communicated to help with migrating code to use new SB6 syntax (to be handled in a future PR).

How to Build and Test the Change

• cd packages/pds-ember
• yarn start
• (another terminal window) yarn storybook
• both yarn commands should not error (warnings are ok)
• local dummy Ember app should be viewable at https://localhost:4300
• Storybook should be viewable at https://localhost:6006

Review Notes

Unless commented in this PR, the following files/paths were copied without modification and are likely safe to skip during review:

• .storybook/*
• addon/components/*
• app/components/*
  • import paths updated to reflect new package name (@hashicorp/pds-ember instead of product-design-system)
• app/styles/*
• blueprints/*
• docs/*
• tests/dummy/*
• tests/unit/*
  • import paths updated to reflect new package name (@hashicorp/pds-ember instead of product-design-system)

Storybook v6!

Apparently in #9, a yarn install automatically updated Storybook to version 6. Fortunately, it appears that there are no major issues with our current content and Storybook 6.

• CONS:
  • The browser console will likely spit out warnings to point out code in story files that would benefit from the latest syntax. These warnings will be addressed in a future PR.
• PROS:
  • The generated props table now displays the correct default values and now also displays the "type" below the description!
  • Storybook navigation is now easier to navigate (better organized with sections instead of sub-folders).

Nav (v5):

Nav (v6):

Button args (v5):

Button args (v6):