fix(DrawCalcV3): set gaugeController as immutable

[PierrickGT]

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[linear]

POOL-2302 Analyze impact of swapping DrawCalculatorV3

DrawCalculatorV3 is dependent of the following contracts:

• gaugeController
• drawBuffer
• prizeConfigHistory

Currently, there are no setter functions to set these contracts. drawBuffer and prizeConfigHistory are immutable, so the only way to update these addresses would be by redeploying the contract.

If we redeploy DrawCalculatorV3, we will need to call the setDrawCalculator function on the PrizeDistributorV2 contract to set the newly deployed DrawCalculator.

Which would be a pretty minimal change and easy fix.

These 3 contracts should not be swapped, except if we notice a bug. So I would recommend to make all variables immutable , since it will be pretty easy to redeploy a DrawCalculator if we need to.

TODO:

• set gaugeController as an immutable variable