Ability to suicide / selfdestruct contracts

[Neotamandua]

Summary

Introduce the ability to self-destruct a contract, making it possible to free up state storage for unused contracts. This feature is useful for cases where a contract has a defined expiration, as it would otherwise force obsolete contracts to impose an unnecessary storage burden on the blockchain.

A practical example is securities such as bonds, which have a fixed expiration (reaching maturity) and retirement date. Once expired, these contracts are no longer needed after a specific period. A smart contract developer could make use of a rusk_abi function to remove the storage of this contract from the chain.