Implement Census3 MVP (1st version)

[jpaulet]

For the MVP:

Election Creation

• Switch between Addresses/Tokens (tab)
• Be able to retrieve X tokens (dropdown with a list of available tokens)
• Be able to select one token and create a census from it
• Create the election from this census
• Vote
• Extend token-scanner to auto-generate tokens created from Aragon DAO with search functionality

Acceptance criteria: Be able to create and vote with a token census.

Backend

• API definition
• Update API packages
• Database schema, migrations and queries
• API implementation census3#11
• Refactor scanner (ongoing) #41
• Integrate vocdoni-node censusDB (mostly done) #42
• Integrate censusDB with scanner service #43
• Generate and publish the census on IPFS #45
• Integrate IPFS connect census3#17
• Persist token scan status on the DB to support tracking via API census3#18
• Calculate birth block of a contract when it is created census3#19
• Unit testing census3#22
• Support something like a tag attribute for the tokens census3#44

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SDK

• Implement token managing (SDK) #47

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Frontend

• Implement census creation from token #48
  - Add a new tab to be able to create a census from tokens (Addresses/Tokens)
  - Add the token dropdown with the SDK call
  - Be able to select and create a census from this token
  - Create the election with a token census