Add polymesh specific changes - do not merge

[HenriqueNogara]

changelog

new features

• Adds the following extrinsics: add_permissioned_validator, remove_permissioned_validator, validate_cdd_expiry_nominators, payout_stakers_by_system, change_slashing_allowed_for, update_permissioned_validator_intended_count, chill_from_governance, set_commission_cap;

modified external API

• Adds the following error variants: StashIdentityDoesNotExist, StashIdentityNotPermissioned, StashIdentityNotCDDed, IdentityIsAlreadyPermissioned, IdentityIsMissingCDD, IntendedCountIsExceedingConsensusLimit, IdentityNotFound, ValidatorNotFound, CommissionTooHigh, CommissionUnchanged;

new external API

• Adds the following storage: PermissionedIdentity, SlashingAllowedFor, ValidatorCommissionCap, PolymeshStorageVersion;

modified events

• The indentity field has been added to the following events: Rewarded, Bonded, Unbonded;

new events

• The following events have been added: Nominated, PermissionedIdentityAdded, PermissionedIdentityRemoved, InvalidatedNominators, SlashingAllowedForChanged, RewardPaymentSchedulingInterrupted, CommissionCapUpdated;

other

• In validate checks if the stash_did is permissioned;
• In validate checks if prefs.commission <= Self::validator_commission_cap();
• In validate instead of checking if Validators::<T>::count() < max_validators checks stash_did_prefs.running_count < stash_did_prefs.intended_count;
• In nominate check if stash identity exists and if it has gone through CDD;
• In nominate call Self::release_running_validator;
• In reap_stash we remove the ensure_signed(origin) check and only allow the extrinsic to be called if it has a balance of zero;
• In do_withdraw_unbonded change ledger.active < T::Currency::minimum_balance() to ledger.active <= T::Currency::minimum_balance();
• In chill_stash add call to Self::release_running_validator;
• In end_era use the scheduler for the rewards;
• In on_offence if SlashingAllowedFor::<T>::get() == SlashingSwitch::None slash_fraction is set to zero;
• Adds max_inflated_issuance and non_inflated_yearly_reward as parameters for computing total payout;

data migration