Feat/subnets

[susruth]

Description

Adding support for subnets, and slashing to the Darknode Registry

Motivation

We need subnets and slashing features to pave way for the Ren L1 launch

Design

We are adding support for 255 subnets by using a uint256 value, where each of the bit corresponds to the inclusion/exclusion of a specific darknode in a subnet.

We created a simple slasher that would allow honest darknodes to slash malicious darknodes by creating and submitting a signature.

• What packages that will be affected by this change? (Related work)

We updated DarknodeRegistryLogicV2 and DarknodeRegistryStateV2 (in DarknodeRegistry.sol) to add subnet support.

We created a Slasher.sol that allows RenVM to submit signatures to slash malicious darknodes.

• What PRs will be affected by this change? (Related work)

PR #133

Unresolved Issues

Overall simplification and rewrite, conversion to hardhat and upgrading to the latest solidity versions