Wiring up steBTC governance

[wtj2021]

• adding 2 additional roles
• StakedEbtc: Donor (donate)
• StakedEbtc: Manager (setMintingFee, sweep, setMaxDistributionPerSecondPerAsset)
• assigning Donor role to fee_recipient_multisig
• assigning Manager role to ebtc_techops_multisig

[petrovska-petro]

adds two new gov roles focus in staking ebtc

1. donate -> scope: only donate(uint256) ✅
2. general mgmt -> scope: sweep(address), setMaxDistributionPerSecondPerAsset(uint256) and setMinRewardsPerPeriod(uint256) ✅

txs to be posted in the timelock batches the sets for the naming of each new role, capabilities/scope and finally the set user role

also adds test on the before/after state to ensure that after the delay of the timelock indeed new roles are configured properly ✅

[sajanrajdev]

Adds governance config of steBTC to the Governor contract (donor/manager role). Gives donor role to eBTC Fee recipient (makes sense as it is the receipient of the PYS). Gives manager access to TechOps, level of security makes sense at this stage.

Introduces test for the above.

LGTM

[sajanrajdev]