Refactor the frontend to handle multiple viruses

[moedarrah]

Using dynamic values (variables) that may differ between viruses, such as column names (which may not apply to all viruses, such as those that do not use pangolins), it would be helpful to have a schema outlining what changes to expect.

• Define fields that may differ
• Adapt how the phylogenetic distances are calculated

[moedarrah]

To refactor the frontend, we need to have a clear understanding of the data that the backend is sending to the frontend. We need a schema that describes the structure of the data that is being sent by the backend to the frontend and what is going to change (Do all viruses use Pangolin and Nextstrain clade?) between different viruses

[talnor]

"classifier":
["type" = "pangolin", "value" = "B.1.1.7",
"type" = "nextclade", "value" = "B.1.2.212"]