Adds Refunder and Asserts on cancel and refund

[Primata]

Description

Adds a Refunder role to Bridge Configs.
This Refunde is the only allowed party to call refund_bridge_transfer and cancel_bridge_transfer

Type of Change

• New feature
• Bug fix
• Breaking change
• Performance improvement
• Refactoring
• Dependency update
• Documentation update
• Tests

Which Components or Systems Does This Change Impact?

• Validator Node
• Full Node (API, Indexer, etc.)
• Move/Aptos Virtual Machine
• Aptos Framework
• Aptos CLI/SDK
• Developer Infrastructure
• Other (specify)

How Has This Been Tested?

Not yet tested

Key Areas to Review

Include framework tests
Test Within the rest of the bridge framework

Checklist

• I have read and followed the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I identified and added all stakeholders and component owners affected by this change as reviewers
• I tested both happy and unhappy path of the functionality
• I have made corresponding changes to the documentation

[franck44]

@0xPrimata Where is the issue that explains the problem and why we need these changes?