[feat] Add state managing

[adrianvrj]

We will use four states for the funds:

0. Inactive
1. Recollecting votes
2. Receiving donations
3. Closed

Please add an enum to manage this states. Apply the logic to this states:

• When fund created state = 1
• When votes > 100 state = 2
• When goal reached state = 3
• If a maintainer considers the fund is not relevant state = 0