Enhancement[ expressive list]: add expressive list to component library

[DianaStanciulescu]

The "expressive list" pattern is used a lot throughout gatsby sites. There are variations in how the rule is designed, spacing and behavior on tablet, so a component with predefined specs would help consistency.

examples of the list in use:

• in full width, top nav, pages:
  https://www.ibm.com/design/practices/
  https://www.ibm.com/design/teams/
  https://www.ibm.com/design/impact/

• in pages with a left nav:
  https://w3.ibm.com/design/about/overview/
  https://w3.ibm.com/design/leadership/overview/
  https://w3.ibm.com/design/community/
  https://www.ibm.com/brand/architecture
  https://www.ibm.com/brand/systems/services/strategy
  https://www.ibm.com/brand/systems/it-infrastructure/expression/strategy/
  https://www.ibm.com/design/language/philosophy/principles/
  https://www.ibm.com/design/language/layout/overview/
  https://www.ibm.com/design/language/illustration/overview/ (with a white background)
  https://www.ibm.com/able/toolkit/plan (with a white background and a pictogram)

specs excerpts:

sketch file:
Expressive list specs_ds3.zip

[DianaStanciulescu]

FYI @vpicone @jeanservaas @mjabbink

[mjabbink]

@DianaStanciulescu Beautiful. These will be super usefu/helpful additions to the theme.

[mjabbink]

What is the status on this @DianaStanciulescu @vpicone?

[mjabbink]

FYI @alisonjoseph @sadekbazaraa

[DianaStanciulescu]

I don't know anything about where these new gatsby components stand, they probably need to be prioritized on the dev side.

[mjabbink]

These new components used to be on the priority list but have been changed and now I’m not sure what the status is. FYI @alisonjoseph and/or @vpicone please chime in and provide a status.

[mjabbink]

@alisonjoseph This issue and #1062 are lingering way too long. They were marked as priority brand items a very, very long time ago and need to be taken to the finish line.
FYI @sadek @kennethhartmann

[mjabbink]

@alisonjoseph Can I assume this is in this sprint?