Mesh 1992/add-max-auths

[HenriqueNogara]

changelog

new features

new external API

• Adds the following error variant to the identity pallet: ExceededNumberOfGivenAuths;
• Adds the following storage tot the identity pallet: NumberOfGivenAuths,OutdatedAuthorizations, CurrentAuthId;

other

• add_auth returns an error if MaxGivenAuths is exceeded;
• ensure_authorization also check if the authorizations is oudated;
• remove_secondary_keys also set authorizations as outdated;
• unsafe_add_auth_for_signers returns an error if MaxGivenAuths is exceeded;
• unverified_add_auth_for_paying_key returns an error if MaxGivenAuths is exceeded;

data migration

• Initializes CurrentAuthId;
• Initializes NumberOfGivenAuths;