feat: freeze array

[pegahcarter]

Adds an array of freezers who have permissions to freeze accounts.

[Copilot]

Pull request overview

This PR introduces a freezer role system that allows designated addresses to freeze accounts, expanding beyond the previous owner-only model. The changes add an isFreezer mapping and related management functions to control which addresses can freeze accounts.

• Adds isFreezer mapping to track authorized freezers
• Implements addFreezer and removeFreezer functions with corresponding events
• Updates freeze and freezeMany functions to allow freezers (not just owner) to freeze accounts

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
src/contracts/fraxtal/frxUSD/versioning/FrxUSD2.sol	Complete implementation of freezer role system with full functionality including add/remove freezer functions, updated access control, events, and errors
src/contracts/ethereum/frxUSD/versioning/FrxUSD2.sol	Partial implementation adding only the isFreezer mapping and storage gap, missing the management functions and access control updates

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