Register generic functions for SneedSwap dApp canister.

This proposal registers the generic function set_canister_ids and its verification function verify_set_canister_ids on the SneedSwap canister.

Proposal to add new NervousSystemFunction:

Function:

NervousSystemFunction { id: 2000, name: "set_canister_ids", description: Some( "Set the ledger and index canister ids of the old and new Sneed tokens.", ), function_type: Some( GenericNervousSystemFunction( GenericNervousSystemFunction { target_canister_id: Some( 5ceyv-syaaa-aaaag-qc43q-cai, ), target_method_name: Some( "set_canister_ids", ), validator_canister_id: Some( 5ceyv-syaaa-aaaag-qc43q-cai, ), validator_method_name: Some( "validate_set_canister_ids", ), }, ), ), }