`Zero-or-test-address` upgrades

[faculerena]

• Check if the address passed is using in mapping.get(). This is not a problem
• Check if 0x...0 is hardcoded.
• Following the last point, we can check for all addresses with known public key (as Alice, Bob...)

Discussion question:

• OpenBrush has a AccountIdExt that thas the is_zero() method. Should we support this as a check?
• Emit Events have any issue using a 0 address? Or we can make the emit_event() whitelisted?

Check if the detection is done in an #[ink(message)]. The detector could not trigger in private functions, as the check should be done in the public one.

[faculerena]

Following #130 and M3 issues.