pallet-idn-manager: unhardcode constants #379
Description
These should be removed from the bridge pallet, and moved into the pallet-idn-manager as part of its config. Such config should be updatable by sudo, and have some genesis/default values.
IdnManagerPalletIdTreasuryAccountSDMultiplierMaxSubscriptionsMaxTerminatableSubsMaxMetadataLenMaxCallDataLen