IncreasingRewardRelayer is a contract meant to pull funds from the
StabilityFeeTreasury and send them to a custom address. The relayer can only be called by a specific address that requests payments.
This contract inherits functionality from the IncreasingTreasuryReimbursement contract.
refundRequestor - address that can request funds
lastReimburseTime - timestamp of the last reimbursement
reimburseDelay - enforced gap between reimbursements
modifyParameters - modify contract parameters
reimburseCaller(feeReceiver: address) - send SF rewards from the treasury to the
refundRequestor is the only address that can call
reimburseCaller and request a stability fee payment from the treasury.
reimburseCaller can only be called again after at least
reimburseDelay seconds have passed since the last call.