Multi-Admin Role System

[Luluameh]

Background
A single admin address is a central point of failure and trust. Different platform operators need different permission levels (e.g., a "fee manager" vs. a "dispute resolver").
Goal
Implement a role-based access control (RBAC) system with at least three roles: SuperAdmin, FeeManager, and DisputeAdmin.
Acceptance Criteria

• DataKey::Role(Address) mapped to a Role enum in Persistent storage.
• grant_role(address, role) and revoke_role(address, role) restricted to SuperAdmin.
• Each sensitive function checks the correct minimum role.
• Emits RoleGranted { address, role } and RoleRevoked { address, role } events.
  Key Files
  contracts/src/admin.rs, contracts/src/roles.rs

[Viv-90]

@Viv-90 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi maintainer I'm a software developer with experience and would love to work on this

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