Add Fast Unpause functionality

[shahthepro]

Code changes

• Adds support for fast unpause
• Adds a new guardian address (points to 2/8), this is need to enable a Safe module that'll allow HyperNative to quickly pause actions
• Adds a new admin address storage slot that points to the 5/8
• Ownable already has a admin for proxy admin, so the variable is named multisigAdmin instead to avoid confusion

Contract size impact

Fast Unpause increases the runtime size of contracts inheriting from AbstractARM

Contract	main	This PR	Increase	EIP-170 margin
MultiAssetARM	23,964 bytes	24,350 bytes	386 bytes	226 bytes
EthenaARM	24,063 bytes	24,449 bytes	386 bytes	127 bytes
OriginARM	24,132 bytes	24,518 bytes	386 bytes	58 bytes
LidoARM	24,877 bytes	25,299 bytes	422 bytes	723 bytes over
EtherFiARM	24,877 bytes	25,299 bytes	422 bytes	723 bytes over

The WETH and USDC MultiAssetARM implementations upgraded by this PR remain below the 24,576-byte EIP-170 runtime limit.

LidoARM and EtherFiARM were already 301 bytes over the limit on main; this PR increases their excess to 723 bytes. They are therefore excluded from the deployment.

The CI contract-size check intentionally excludes LidoARM, EtherFiARM, and OriginARM.

[naddison36]

Looks nice and simple. Thanks

[naddison36]

LTGM

[clement-ux]

Non-blocking suggestion: we could consolidate onlyPauser and onlyUnpauser by checking msg.sig == this.pause.selector in a shared internal authorization helper, then have a single modifier call that helper. For example:

modifier onlyPauserOrUnpauser() {
    _checkPauserOrUnpauser();
    _;
}

function _checkPauserOrUnpauser() internal view {
    bool isPause = msg.sig == this.pause.selector;
    if (
        msg.sender != _owner() && msg.sender != adminMultisig
            && (!isPause || (msg.sender != operator && msg.sender != guardian))
    ) {
        if (isPause) revert OnlyPauser();
        revert OnlyUnpauser();
    }
}

Both pause() and unpause() would then use onlyPauserOrUnpauser.

It reduces bytecode size by 8. Not sure the change is worth it though.

[clement-ux]

While I've left a comment, I'm still approving it like this.

[clement-ux]

LGTM 👍