Rescue strategy

[dglowinski]

The PR introduces a RescueStrategy. It allows curators to withdraw funds from strategies to distribute fairly to users when vault faces large debt socializations.

Rescue procedure:
- Euler installs a perspective in the earn factory which allows adding custom strategies
- RescueStrategy contracts are deployed for each earn vault to rescue.
Immutable params:
o Rescue account: is allowed to call the rescue functions and receives rescued assets and shares
o Earn vault: the strategy can only work with the specified vault. If another vault tries to enable it, it will revert on acceptCap
- Euler registers the strategies in the perspective
- Curator installs the strategy with unlimited cap (submit/acceptCap)
- Curator sets the new strategy as the only one in supply queue and moves it to the front of withdraw queue
o at this stage the regular users can't deposit or withdraw from earn
- Rescue account calls one of the rescueX functions (for Euler, Morpho or Aave flash loan sources), specifying the asset amount to flashloan
o flash loan is used to create earn vault shares, it just passes through earn vault back to the rescue strategy where it is repaid
o the shares are used to withdraw as much as possible from the underlying strategies to the rescue account

[certora-run]

Verification Results

• Group ID: 17986bd1-3a60-42a2-9c10-edcfb764b6b0

Job	Result	VERIFIED	Link
TimelockRemovableTime.conf	✅	2	Link
Timelock.conf	✅	9	Link
SolvencyInternal.conf	✅	4	Link
Solvency.conf	✅	2	Link
Roles.conf	✅	4	Link
Reverts.conf	✅	19	Link
Reentrancy.conf	✅	1	Link
Range.conf	✅	6	Link
PendingValues.conf	✅	7	Link
LostAssets.conf	✅	8	Link
Liveness.conf	✅	2	Link
Immutability.conf	✅	1	Link
ERC4626.conf	✅	9	Link
Enabled.conf	✅	10	Link
Conversions.conf	✅	6	Link
ConsistentStateExtras.conf	✅	2	Link
ConsistentStateExtras3Sanity.conf	✅	2	Link
ConsistentStateExtras2.conf	✅	2	Link
ConsistentState.conf	✅	10	Link
Balances.conf	✅	6	Link