Implement Cross-chain Pledges via IBC Protocols

[OluRemiFour]

Close: #363

Description

I've implemented the core logic for cross-chain pledges. Here's what was done:

1. Updated types.rs : Added new DataKey entries for cross-chain pledge storage, plus new types CrossChainPledgeStatus and CrossChainPledge.
2. Created cross_chain_pledge component : Implemented functions for creating, updating, and querying cross-chain pledges.
3. Added events : Added CrossChainPledgeCreatedEvent and CrossChainPledgeUpdatedEvent with emission functions in events.rs.
4. Updated ShadeTrait : Added new methods to the ShadeTrait interface to expose the cross-chain pledge functionality.
5. Updated shade.rs : Implemented the new ShadeTrait methods, using the cross_chain_pledge component.
6. Updated errors.rs : Added a NotFound error variant.
   The implementation follows the existing codebase's patterns and includes proper auth checks and pausable functionality!

Type of Change

• 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 not work as expected)
• Documentation update
• Code refactoring
• Test improvements
• Other (please describe):

Related Issues

Fixes #

Changes Made

Testing

• I have added tests that prove my fix is effective or that my feature works
• All existing tests pass locally
• I have tested this manually

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Notes

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[OluRemiFour]

Done, Close: #393