Feature/async census creation

[lucasmenendez]

now when the user tries to create a new census, it is included into the database and generated in background, a new census column has been created on the database called 'published' that indicates if the current census is built and published on IP

[lucasmenendez]

New flow to create and publish a census:

1. Create a token

wget --method POST \
  --header 'Accept: */*' \
  --header 'Content-Type: application/json' \
  --body-data '{"id": "0xa117000000f279D81A1D3cc75430fAA017FA5A2e","type": "erc20"}' \
  --output-document \
  - https://census3.dev.vocdoni.net/api/token

Response:

Ok

2. Create census with strategyID that includes the created token:

wget --method POST \
  --header 'Accept: */*' \
  --header 'Content-Type: application/json' \
  --body-data '{"strategyId": 1}' \
  --output-document \
  - https://census3.dev.vocdoni.net/api/census

Response:

{
  "queueId": "7c208c69d85dc187725395124514baea3bc5498c"
}

3. Get the census creation status from the queue with the queueID resulting of previous request:

wget --method GET \
  --header 'Accept: */*' \
  --output-document \
  - https://census3.dev.vocdoni.net/api/census/queue/7c208c69d85dc187725395124514baea3bc5498c

Response:

{
  "census": {
    "censusId": 1,
    "strategyId": 1,
    "merkleRoot": "8f2d3b5c15445e6ec3bfe6a5f52c2be1de916ca296ce7474982b4a66b34d3f30",
    "uri": "ipfs://bafybeihb5krnn2muubms27gn6egevrjxeb5z7ttp35eqzi3b33ejqwntka",
    "size": 10,
    "weight": "320822718213393032631430073323170650669553037360",
    "chainId": 5,
    "anonymous": true
  },
  "done": true,
  "error": null
}