Add election type, census type and domain into the election metadata

[jpaulet]

For the UI we need to know which election type and census is every election, add this information into the election metadata.

Additionally, being able to add some sort of "domain/space" to know which project created each election (Aragon, Decidim, etc.). We need to decide if this information is stored in the election or into the org.

[marcvelmer]

This is already possible using the meta of elections or accounts.

This question is strictly the responsibility of the SDK consumer (the UI in this case).