Task for adding guards

[0xSulpiride]

Description

• Added a cli task to automate the process of adding new guards to GatewayV2. It will make all relayers and the estimator a guardian

USAGE
npx hardhat add-guards --network [network] (--env [testnet|mainnet]) (--estimator estimator address)
--env is optional, testnet by default
--estimator is optional

Example:
npx hardhat add-guards --network goerli --env testnet --estimator 0x0408ff3B0A2cE1a0D5c25a0D4a387332f814Bd72

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)