Abstract/de-duplicate species data

[MattIPv4]

Currently, we store species/scientific/iucn/native for each ambassador, though this data is the same for all ambassadors of the same species. When lifespan was added (#83), this was abstracted/de-duplicated for species, but only this property.

Create a new species.ts file with a constant that has keys matching lifespans.ts, with each property having name (species from ambassadors.ts), scientific, iucn, native + lifespan properties defined.

Use a key-value relationship similar to what is done for enclosure (and soon class in #86), with a getSpecies getter for the data and isSpecies as a type-guard for the key.

This will require PRs into the website and extension as this will be a breaking change for how we access this data (now needing to use species via getSpecies, which will then return all the nested abstracted/de-duplicated data).