Epics as a list option for Issue Boards

Problem to solve

surfaced in #207899 (comment 308837120)

As a User of issue boards,

I want to add lists to my issue board that represent epics,

So i can map issues to epics easier, and vizualize my issues within each epic

Intended users

• Parker (Product Manager)
• Delaney (Development Team Lead)

Proposal

Add Epics as a list option for Issue Boards :