Register generic functions for SneedSwap dApp canister.

This proposal registers the generic function burn_old_tokens and its verification function validate_burn_old_tokens on the SneedSwap canister.

Proposal to add new NervousSystemFunction:

Function:

NervousSystemFunction { id: 2001, name: "burn_old_tokens", description: Some( "Burn the specified amount of old tokens gathered on the canister.", ), function_type: Some( GenericNervousSystemFunction( GenericNervousSystemFunction { target_canister_id: Some( 5ceyv-syaaa-aaaag-qc43q-cai, ), target_method_name: Some( "burn_old_tokens", ), validator_canister_id: Some( 5ceyv-syaaa-aaaag-qc43q-cai, ), validator_method_name: Some( "validate_burn_old_tokens", ), }, ), ), }