Register Unicycle function: Unicycle: Set Proposal Neuron

Registers the Unicycle "Unicycle: Set Proposal Neuron" custom function on this SNS so it can be invoked by proposal.

Proposal to add new NervousSystemFunction:

Function:

NervousSystemFunction { id: 4006, name: "Unicycle: Set Proposal Neuron", description: Some( "Set the neuron Unicycle uses to submit proposals for this SNS.", ), function_type: Some( GenericNervousSystemFunction( GenericNervousSystemFunction { target_canister_id: Some( 2ccdl-vaaaa-aaaan-q6h5a-cai, ), target_method_name: Some( "snsSetProposalNeuron", ), validator_canister_id: Some( 2ccdl-vaaaa-aaaan-q6h5a-cai, ), validator_method_name: Some( "snsSetProposalNeuronValidate", ), topic: Some( ApplicationBusinessLogic, ), }, ), ), }