feat: ProtocolHandler self management functions

[obatirou]

What is the new behavior?

• Add the self management function for the ProtocolHandler
• Introduces cairo-coverage for snfoundry and assert_macros

// Self management
* fn change_operator(new_address_operator: ContractAddress) SECURITY_COUNCIL
* fn change_security_council(new_security_council_address: ContractAddress) SECURITY_COUNCIL
* fn add_guardian(new_guardians_address: ContractAddress) SECURITY_COUNCIL
* fn remove_guardian(guardian_to_remove_address: ContractAddress) SECURITY_COUNCIL
* fn change_gas_price_admin(new_gas_price_admin: ContractAddres) SECURITY_COUNCIL

[obatirou]

Maybe add documentation on the behavior of Vec with the remove and add ?
Should this storage variable be kept ?

[enitrat]

I don't understand your comment

[obatirou]

This is related to the discussion about storage vec not being able to remove an element. The length will not change when a guardian is removed.