Bounties: Propose curator

[PaulSff]

The feature allows for Council members to propose Curator for bounties Funded. The council vote is going to be initiated to either accept or reject the Curator proposed.

https://wallet.3dpass.org/governance/bounties

Reference:
https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Frpc.3dpass.org#/bounties