Annotate lineages with names (eg: Delta)

[priesgo]

I initially thought of having a new lineages table in the database, where the PK is the Pangolin lineage identifier (ie: B.1.1.7) and additionally we have metadata about like WHO designation (ie: Delta), flag of VOC, parent lineage, etc.

This is a good resource to fetch such data: https://github.com/cov-lineages/constellations
There may be others.

Subtasks:

• Define data model for the lineage table
• Research the best resource to fetch such information
• Integrate this data in the CoVigator package (via git submodule if possible)
• Load data in DB at DB startup

[priesgo]

Add maybe a radio button into the lineages tab to switch to WHO names (eg: alpha, delta) instead of pangolin ids