Also replace contract owner for parameter administration role

Initiator is just the entity that calls initiateRitual(), needs to be authorized, and provides initial payment.
Authority is who controls ritual lifecycle going forward.

Fee Models dictate what's the cost for rituals

Also, changes AccessControl base contract for the more specific AccessControlDefaultAdminRules

Also, change isInitiationRegulated to isInitiationPublic

See https://github.com/keep-network/keep-core/blame/main/solidity/random-beacon/contracts/ReimbursementPool.sol

Can't revoke INITIATOR_ROLE addresses since our AccessControl doesn't inherit from AccessControlEnumerable. It doesn't matter much anyway

We may want to parametrize tests based on this

Add also previous StakeInfo deployment on Mumbai

Either ritual is successful and fees can be used by the protocol, or ritual is failed and fees are refunded to initiator (consider partial refund)

…es long (as of nucypher-core v0.10.0).

Closes #78

…or the moment

We currently define it as the lowest value that produces a threshold set that's strictly greater than the 50% of the overall size.
See nucypher/nucypher#3095

See #106

We can revert to a composition model later, but for the moment this will make our lives easier

…ead of hash

Closes #97